| Main Entry: | impregnable |
| Part of Speech: | adjective |
| Definition: | unyielding |
Synonyms: |
firm, fortified, impenetrable, indestructible, invincible, invulnerable, secure, solid, strong, unassailable |
| Main Entry: | dangerous |
| Part of Speech: | adjective |
| Definition: | hazardous, troubling |
Synonyms: |
alarming, bad, breakneck, chancy, critical, dangersome, deadly, delicate, dynamite, exposed, fatal, formidable, hairy*, heavy*, hot*, impending, impregnable, insecure, jeopardous, loaded, malignant, menacing, mortal, nasty, on collision course, parlous, 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 |
Antonyms: |
careful, guarded, safe, secure, unhazardous, untroubled |
| Main Entry: | fast |
| Part of Speech: | adjective |
| Definition: | fixed, immovable |
Synonyms: |
adherent, ardent, attached, close, constant, constrained, durable, faithful, fastened, firm, fortified, glued, held, impregnable, indelible, inextricable, lasting, loyal, permanent, resistant, resolute, secure, set, sound, stable, staunch, steadfast, stuck, sure, tenacious, tight, true, true blue, unwavering, wedged |
Antonyms: |
flexible, impermanent, insecure, loose, movable, unattached, unfixed |
| Main Entry: | formidable |
| Part of Speech: | adjective |
| Definition: | horrible, terrifying |
Synonyms: |
appalling, awful, dangerous, daunting, dire, dismaying, dreadful, fearful, fierce, frightful, horrific, imposing, impregnable, intimidating, menacing, redoubtable, shocking, terrible, terrific, threatening |
Antonyms: |
feeble, friendly, harmless, nice, pleasant, powerless, weak |
| Main Entry: | indomitable |
| Part of Speech: | adjective |
| Definition: | steadfast, unyielding |
Synonyms: |
dogged, impassable, impregnable, insuperable, insurmountable, invincible, invulnerable, obstinate, pertinacious, resolute, ruthless, staunch, stubborn, unassailable, unbeatable, unconquerable, undefeatable, unflinching, willful |
Antonyms: |
beatable, conquerable, unstable, weak, yielding |
| Main Entry: | insurmountable |
| Part of Speech: | adjective |
| Definition: | impossible |
Synonyms: |
forget it, hopeless, impassable, impregnable, inaccessible, indomitable, ineluctable, insuperable, invincible, no way, no-win, not a prayer, overwhelming, unbeatable, unconquerable, unmasterable |
Antonyms: |
attainable, beatable, defeatable, possible, surmountable |
| Main Entry: | invincible |
| Part of Speech: | adjective |
| Definition: | indestructible |
Synonyms: |
bulletproof, impassable, impregnable, indomitable, insuperable, inviolable, invulnerable, irresistible, powerful, strong, unassailable, unattackable, unbeatable, unconquerable, undefeatable, unsurmountable, untouchable, unyielding |
Antonyms: |
beatable, breakable, conquerable, destructible |
| Main Entry: | invulnerable |
| Part of Speech: | adjective |
| Definition: | invincible |
Synonyms: |
bulletproof, impassable, impenetrable, impregnable, indestructible, powerful, secure, strong, unbeatable, untouchable |
| Main Entry: | safe |
| Part of Speech: | adjective |
| Definition: | free from harm |
Synonyms: |
buttoned up, cherished, free from danger, guarded, home-free, impervious, impregnable, in safety, intact, inviolable, invulnerable, maintained, okay*, out of danger, out of harm's way, preserved, protected, safe and sound, safeguarded, secure, sheltered, shielded, sitting pretty, snug, tended, unassailable, undamaged, under lock and key, under one's wing, unharmed, unhurt, uninjured, unmolested, unscathed, unthreatened, vindicated, watched |
Antonyms: |
exposed, unguarded, unprotected, unsafe, vulnerable |
| Main Entry: | secure |
| Part of Speech: | adjective |
| Definition: | safe |
Synonyms: |
defended, guarded, immune, impregnable, out of harm's way, protected, riskless, sheltered, shielded, unassailable, undamaged, unharmed |
Antonyms: |
endangered, insecure, unprotected, unsafe |