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formidable - 20 thesaurus results
| Main Entry: | formidable |
| Part of Speech: | adjective |
| Definition: | horrible, terrifying |
| Synonyms: | appalling, awful, dangerous, dire, dreadful, fearful, fierce, frightful, imposing, impregnable, intimidating, menacing, redoubtable, shocking, terrible, terrific, threatening, daunting, dismaying, horrific |
| Antonyms: | feeble, friendly, harmless, nice, pleasant, powerless, weak |
| Main Entry: | formidable |
| Part of Speech: | adjective |
| Definition: | difficult, overwhelming |
| Synonyms: | arduous, awesome, colossal, great, hard, impressive, indomitable, intimidating, labored, laborious, mammoth, mighty, murder*, onerous, overpowering, powerful, rough*, staggering, strenuous, toilsome, tough*, tremendous, uphill*, all-powerful, ballbuster, challenging, dismaying, effortful, puissant, rough go, tall order, tough proposition |
| Antonyms: | easy, pleasant, trivial, not hard |
* = informal/non-formal usage
| Main Entry: | appalling |
| Part of Speech: | adjective |
| Definition: | horrifying |
| Synonyms: | alarming, astounding, awful, bad, dire, dreadful, fearful, formidable, frightening, frightful, ghastly, grim, gross*, harrowing, heavy*, hideous, horrible, intimidating, mean, shocking, terrible, terrifying, daunting, disheartening, dismaying, grody, horrid, horrific, petrifying, scaring, the end, unnerving |
| Antonyms: | comforting, encouraging, satisfying, reassuring |
* = informal/non-formal usage
| Main Entry: | arduous |
| Part of Speech: | adjective |
| Definition: | difficult, hard to endure |
| Synonyms: | backbreaking, burdensome, formidable, grueling, harsh, heavy, labored, laborious, murder, onerous, painful, punishing, rigorous, rough, severe, strenuous, taxing, tiring, toilsome, tough, troublesome, trying, uphill, exhausting, fatiguing, no picnic |
| Antonyms: | easy, facile, motivating |
| Main Entry: | awesome |
| Part of Speech: | adjective |
| Definition: | amazing |
| Synonyms: | alarming, astonishing, awe-inspiring, awful, beautiful, breathtaking, dreadful, exalted, fearful, formidable, frantic, frightening, grand, hairy*, horrible, imposing, impressive, intimidating, magnificent, majestic, mean, mind-blowing*, moving, nervous, overwhelming, shocking, striking, stunning, terrible, terrifying, wonderful, wondrous, daunting, fearsome, horrifying, real gone, something else, stupefying, zero cool |
| Antonyms: | unamazing |
* = informal/non-formal usage
| Main Entry: | dangerous |
| Part of Speech: | adjective |
| Definition: | hazardous, troubling |
| Synonyms: | alarming, bad, breakneck*, chancy, critical, deadly, delicate, dynamite, exposed, fatal, formidable, hairy*, heavy*, hot*, impending, impregnable, insecure, loaded, malignant, menacing, mortal, nasty, perilous, portentous, precarious, pressing, queasy, risky, serious, serpentine, shaky, speculative, terrible, thorny*, threatening, ticklish*, touch-and-go, touchy, treacherous, ugly*, unhealthy, unsafe, unstable, urgent, viperous, vulnerable, wicked, dangersome, jeopardous, on collision course, parlous |
| Antonyms: | careful, guarded, safe, secure, untroubled, unhazardous |
* = informal/non-formal usage
| Main Entry: | dreadful |
| Part of Speech: | adjective |
| Definition: | horrible, frightening |
| Synonyms: | abominable, alarming, appalling, atrocious, awful, bad, beastly, creepy*, dire, distressing, fearful, formidable, frightful, frozen, ghastly, grievous, grim, gross*, hideous, icky*, lousy, mean, monstrous, rotten, shameful, shocking, spooky, terrible, terrific, tragic, tremendous, wicked, godawful, grody, horrendous, horrific, shuddersome |
| Antonyms: | pleasant, pleasing, welcomed, wonderful |
* = informal/non-formal usage
| Main Entry: | grim |
| Part of Speech: | adjective |
| Definition: | hopeless, horrible in manner, appearance |
| Synonyms: | austere, barbarous, bleak, cantankerous, churlish, cruel, crusty, dogged, ferocious, fierce, forbidding, foreboding, formidable, frightful, funereal, ghastly, gloomy, glum, grisly, grouchy, gruesome, grumpy*, harsh, hideous, implacable, inexorable, intractable, merciless, morose, ominous, relentless, resolute, ruthless, severe, shocking, sinister, somber, sour, stern, stubborn, sulky, sullen, surly, terrible, truculent, unrelenting, unyielding, crabbed, glowering, horrid, scowling, splenetic |
| Antonyms: | bright, cheerful, happy, hopeful, joyful, sunny |
* = informal/non-formal usage
| Main Entry: | knotty |
| Part of Speech: | adjective |
| Definition: | troublesome |
| Synonyms: | baffling, complex, complicated, difficult, elaborate, formidable, hard, intricate, involved, labyrinthine, perplexing, puzzling, rough, rugged, sophisticated, sticky*, terrible, thorny*, tough, tricky, uphill*, Gordian, effortful, mazy, mystifying, nodulous, problematical, ramified, reticular |
| Antonyms: | simple, uncomplicated, untroublesome |
* = informal/non-formal usage
| Main Entry: | onerous |
| Part of Speech: | adjective |
| Definition: | difficult; requiring hard labor |
| Synonyms: | arduous, austere, backbreaking, burdensome, cumbersome, demanding, difficult, distressing, exacting, excessive, exigent, formidable, galling, grave, grinding, grueling, hard*, harsh, headache, heavy*, intolerable, irksome, laborious, merciless, oppressive, overpowering, painful, ponderous, pressing, responsible, rigorous, serious, severe, strenuous, taxing, tiresome, tiring, toilsome, troublesome, vexatious, weighty, crushing, embittering, exhausting, fatiguing, overtaxing, plodding |
| Antonyms: | common, easy, light, trivial |
* = informal/non-formal usage
| Main Entry: | shocking |
| Part of Speech: | adjective |
| Definition: | outrageous; very surprising |
| Synonyms: | abominable, appalling, atrocious, awful, burning, crying, desperate, detestable, direful, disgraceful, disgusting, disquieting, distressing, dreadful, fearful, formidable, foul, frightful, ghastly, glaring, hateful, heinous, hideous, horrible, loathsome, monstrous, nauseating, odious, offensive, repulsive, revolting, scandalous, shameful, sickening, terrible, ugly, unspeakable, horrific, horrifying, stupefying |
| Antonyms: | calming, comforting, soothing |
| Main Entry: | tremendous |
| Part of Speech: | adjective |
| Definition: | huge, overwhelming |
| Synonyms: | amazing, appalling, astounding, awesome, awful, blimp, colossal, deafening, dreadful, enormous, excellent, exceptional, extraordinary, fabulous, fantastic, fearful, formidable, frightful, gargantuan, gigantic, great, humongous, immense, incredible, jumbo*, large, mammoth, marvelous, massive, monstrous, monumental, prodigious, stupendous, super, terrible, terrific, titanic, towering, vast, whale*, whopper, whopping, wonderful, cracking, great big, mondo |
| Antonyms: | insignificant, little, small, tiny, unimportant, underwhelming |
* = informal/non-formal usage
| Main Entry: | difficult |
| Part of Speech: | adjective |
| Definition: | hard on someone; hard to do |
| Synonyms: | Gargantuan*, Herculean*, ambitious, arduous, bothersome, burdensome, crucial, demanding, exacting, formidable, galling, heavy, immense, intricate, irritating, labored, laborious, onerous, operose, painful, problem, problematic, prohibitive, rigid, severe, stiff, strenuous, titanic, toilsome, tough, troublesome, trying, unyielding, uphill, wearisome, backbreaker, challenging, difficile, easier said than done, effortful, hard-won, no picnic, not easy, upstream |
| Antonyms: | calm, easy, free, manageable, plain, simple, uncomplicated |
* = informal/non-formal usage
| Main Entry: | frightful/frightening |
| Part of Speech: | adjective |
| Definition: | scary, shocking |
| Synonyms: | alarming, appalling, atrocious, awesome, awful, chilling, dire, direful, disquieting, dread, dreadful, fearful, formidable, ghastly, grim, grisly, gruesome, hair-raising, hairy, harrowing, hideous, horrible, inconceivable, intimidating, lurid, macabre, menacing, morbid, ominous, portentous, repellent, spooky, terrible, terrifying, unspeakable, daunting, dismaying, fearsome, grabber, horrendous, horrid, horrifying, petrifying, traumatic, unnerving |
| Antonyms: | calming, comforting, pleasing |
| Main Entry: | high |
| Part of Speech: | adjective |
| Definition: | tall; at a great distance aloft |
| Synonyms: | aerial, alpine, big, colossal, elevated, eminent, flying, formidable, giant, gigantic, grand, great, huge, immense, large, lofty, long, soaring, steep, towering, tremendous, altitudinous, high rise, high-reaching, hovering, sky-high, sky-scraping, uplifted, upraised |
| Antonyms: | low, lowly, short, stunted, dwarfed |
| Main Entry: | terrific |
| Part of Speech: | adjective |
| Definition: | intense |
| Synonyms: | appalling, awesome, awful, deafening, disquieting, dreadful, enormous, excessive, extreme, fearful, fierce, formidable, frightful, gigantic, great, harsh, horrible, huge, immense, large, monstrous, severe, shocking, terrible, thunderous, tremendous, agitating, horrific, terrorizing, upsetting |
| Antonyms: | calm, moderate |
| Main Entry: | ambitious |
| Part of Speech: | adjective |
| Definition: | requiring great effort, ability |
| Synonyms: | arduous, bold, demanding, difficult, elaborate, energetic, exacting, formidable, grandiose, hard, impressive, industrious, lofty, pretentious, severe, strenuous, visionary, challenging |
| Antonyms: | easy, facile |
| Main Entry: | difficult |
| Part of Speech: | adjective |
| Definition: | complicated; hard to comprehend |
| Synonyms: | abstract, abstruse, baffling, complex, confusing, dark, deep, delicate, enigmatic, esoteric, formidable, hidden, inexplicable, intricate, involved, knotty, labyrinthine, loose, meandering, mysterious, mystical, nice, obscure, obstinate, perplexing, profound, puzzling, rambling, subtle, tangled, thorny, ticklish, troublesome, unclear, unfathomable, unintelligible, bewildering, confounding, enigmatical, entangled, hard to explain, hard to solve, mystifying, paradoxical, problematical, vexing |
| Antonyms: | easy, simple, straightforward, uncomplicated |
| Main Entry: | fearful |
| Part of Speech: | adjective |
| Definition: | horrifying |
| Synonyms: | appalling, astounding, atrocious, awful, baleful, creepy, dire, distressing, dreadful, eerie, formidable, frightful, ghastly, ghoulish, grievous, grim, grisly, gruesome, hair-raising*, hideous, horrible, lurid, macabre, monstrous, morbid, overwhelming, redoubtable, shocking, sinister, strange, sublime, terrible, tremendous, unearthly, unspeakable, bloodcurdling, horrendous, horrific, shuddersome |
| Notes: | someone may be fearful; someone or something may be fearsome |
| Antonyms: | good, nice, pleasant |
* = informal/non-formal usage
| Main Entry: | hard |
| Part of Speech: | adjective |
| Definition: | difficult, exhausting |
| Synonyms: | Herculean*, arduous, backbreaking, bothersome, burdensome, complicated, demanding, distressing, exacting, formidable, grinding, hairy*, heavy*, intricate, involved, irksome, knotty*, labored, laborious, mean, merciless, murder, onerous, operose, rigorous, rough, rugged, scabrous, serious, severe, slavish, sticky, strenuous, terrible, tiring, toilsome, tough, troublesome, unsparing, uphill*, wearing, wearisome, difficile, effortful, fatiguing, toilful, uphill battle, wearying |
| Antonyms: | easy, facile, mild, simple |
* = informal/non-formal usage
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2009 by the Philip Lief Group.
Cite This Source
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2009 by the Philip Lief Group.
Cite This Source
Copyright © 2009, Dictionary.com, LLC. All rights reserved.
