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insidious - 20 thesaurus results
Main Entry: insidious
Part of Speech: adjective
Definition: sneaky, tricky
Synonyms: Machiavellian, artful, astute, corrupt, crafty, crooked, cunning, dangerous, deceitful, deceptive, deep, designing, dishonest, disingenuous, duplicitous, false, foxy, intriguing, perfidious, perilous, secret, slick, sly, smooth, snaky*, stealthy, subtle, surreptitious, treacherous, wily, wormlike, ensnaring, guileful, like a snake in the grass, sneaking
Notes: insidious (Latin insidere 'to lie in wait for,' from sedere 'sit') describes stealthy, treacherous behavior; invidious behavior arouses ill will, animosity, or hostility
Antonyms: fair, honest, open, sincere
Main Entry: crafty
Part of Speech: adjective
Definition: clever, scheming
Synonyms: adroit, artful, astute, cagey, calculating, canny, cunning, deceitful, deep, designing, devious, disingenuous, duplicitous, foxy*, fraudulent, insidious, intelligent, keen, knowing, sharp, shrewd, slick, slippery*, sly, smart, smooth, street smart*, subtle, tricky, vulpine, wily, crazy like fox, guileful, streetwise
Antonyms: honest, naive, unclever
Main Entry: deceitful
Part of Speech: adjective
Definition: dishonest, insincere
Synonyms: artful, astute, clandestine, counterfeit, crafty, cunning, deceptive, delusive, designing, disingenuous, double-dealing, duplicitous, fallacious, false, feline, foxy, fraudulent, furtive, hypocritical, illusory, indirect, insidious, knavish, lying, mendacious, misleading, rascal, roguish, shifty, slick, sly, sneaky, stealthy, subtle, treacherous, tricky, two-faced*, underhand, underhanded, untrustworthy, untruthful, wily, astucious, beguiling, deceiving, delusory, guileful, impostrous
Antonyms: faithful, frank, honest, loyal, open, sincere, trustworthy, truthful, upright
Main Entry: deceptive
Part of Speech: adjective
Definition: dishonest
Synonyms: ambiguous, bum*, catchy, crafty, cunning, deceitful, delusive, designing, disingenuous, fake, fallacious, false, fishy, foxy, fraudulent, illusory, indirect, insidious, lying, misleading, mock, oblique, off*, phony, plausible, rascal, roguish, scheming, seeming, serpentine, shifty, slick, slippery, sly, sneaky, snide, specious, spurious, subtle, treacherous, tricky, two-faced*, underhand, underhanded, unreliable, wily, astucious, beguiling, deceiving, deluding, delusory, imposturous
Antonyms: forthright, frank, honest, open, truthful, upright
Main Entry: disingenuous
Part of Speech: adjective
Definition: insincere
Synonyms: artful, crooked, cunning, deceitful, designing, dishonest, duplicitous, false, feigned, foxy, indirect, insidious, mendacious, oblique, shifty*, sly, tricky, two-faced*, underhanded, unfair, wily, guileful, uncandid, unfrank
Antonyms: frank, honest, ingenuous, naive, sincere
Main Entry: foxy
Part of Speech: adjective
Definition: shrewd
Synonyms: artful, astute, canny, crafty, cunning, deceitful, deep, devious, dishonest, experienced, insidious, intelligent, knowing, sharp, slick, sly, subtle, tricky, vulpine, wily, guileful, retiary
Antonyms: naive, unintelligent, unclever, unsmart
Main Entry: furtive
Part of Speech: adjective
Definition: sneaky, secretive
Synonyms: artful, calculating, cautious, circumspect, clandestine, cloaked, covert, crafty*, creepy*, cunning, disguised, elusive, evasive, foxy, hidden, hush-hush*, insidious, masked, scheming, shifty*, sly, stealthy, surreptitious, tricky*, under wraps*, undercover, underhand, underhanded, wily, conspiratorial, guileful, skulking, slinking, sub-rosa, under-the-table
Antonyms: aboveboard, forthright, honest, open, truthful
Main Entry: mischievous
Part of Speech: adjective
Definition: devilish, wicked
Synonyms: arch, artful, bad, bothersome, damaging, dangerous, deleterious, destructive, detrimental, evil, foxy*, frolicsome, harmful, hazardous, holy terror*, hurtful, ill, impish, injurious, insidious, irksome, malicious, malignant, naughty, nocuous, perilous, pernicious, playful, precarious, puckish, rascal, risky, rude, sinful, sly, spiteful, sportive, teasing, tricky, troublesome, vexatious, vicious, wayward, dickens, exasperating, ill-behaved, misbehaving, rascally, vexing
Antonyms: good, nice, obedient, behaved
Main Entry: perfidious
Part of Speech: adjective
Definition: treacherous
Synonyms: deceitful, deceptive, double-dealing*, faithless, false, insidious, misleading, recreant, shifty*, slick*, snake in the grass, traitorous, two-faced*, two-timing, undependable, unfaithful, unreliable, untrustworthy, betraying, double-crossing, unloyal
Main Entry: shifty
Part of Speech: adjective
Definition: deceitful, untrustworthy
Synonyms: cagey, collusive, crafty, crooked, cunning, devious, dishonest, duplicitous, elusive, evasive, fly-by-night*, foxy, fraudulent, furtive, insidious, lying, mendacious, roguish, scheming, shady, shrewd, slick, slimy*, slippery, sly, sneaky, treacherous, tricky, underhand, unprincipled, untruthful, wily, conniving, contriving, dodging, equivocating, prevaricative, prevaricatory, shuffling, unhonest
Antonyms: forthright, frank, honest, trustworthy
Main Entry: underhand
Part of Speech: adjective
Definition: deceitful
Synonyms: clandestine, concealed, crafty, crooked, cunning, deceptive, devious, dishonest, dishonorable, duplicitous, fraudulent, furtive, hush-hush*, indirect, insidious, oblique, secret, secretive, shady, shifty, slippery*, sly*, sneaky, stealthy, surreptitious, treacherous, tricky, two-faced*, two-timing, under wraps*, undercover, underhanded, unethical, unfair, unjust, unscrupulous, wily, dirty-dealing, double-crossing, guileful, on the QT, on the quiet, sneaking, sub-rosa
Antonyms: aboveboard, forthright, frank, honest
Main Entry: wily
Part of Speech: adjective
Definition: crafty, clever
Synonyms: arch, artful, astute, cagey, crooked, cunning, deceitful, deceptive, deep, designing, foxy, greasy*, insidious, intriguing, knowing, sagacious, scheming, sharp, shifty, shrewd, slick*, slippery*, sly, smooth, sneaky, tricky, underhanded, crazy like a fox, guileful, streetwise
Main Entry: cunning
Part of Speech: adjective
Definition: devious
Synonyms: Machiavellian, acute, artful, astute, cagey, canny, crafty, deep, foxy, insidious, keen, knowing, sharp, shifty, shrewd, slick, slippery, sly, smart, smarts, smooth, street-smart, subtle, tricky, wary, wily, crazy like fox, fancy footwork, guileful, sly boots, streetwise
Antonyms: gullible, kind, naive, shy
Main Entry: devious
Part of Speech: adjective
Definition: dishonest, crafty
Synonyms: artful, calculating, crooked, deceitful, double-dealing, duplicitous, errant, erring, evasive, fishy*, foxy*, fraudulent, indirect, insidious, insincere, oblique, put on, roundabout, scheming, shady, shifty, shrewd, sly, sneaky, surreptitious, treacherous, tricky, underhanded, wily, faking one out, guileful, not straightforward, obliquitous, playing games, playing politics, sneaking
Antonyms: artless, frank, honest, open, straightforward, trustworthy, truthful
Main Entry: treacherous
Part of Speech: adjective
Definition: dishonest, disloyal
Synonyms: catchy, deceitful, deceptive, double-dealing*, duplicitous, faithless, false, fly-by-night*, insidious, misleading, perfidious, recreant, shifty*, slick*, slippery*, snake in the grass, traitorous, tricky, two-faced*, two-timing, undependable, unfaithful, unreliable, untrue, untrustworthy, betraying, double-crossing, false-hearted, treasonable, unloyal
Antonyms: forthright, honest, loyal, true
Main Entry: snaky
Part of Speech: adjective
Definition: devious, sly
Synonyms: crafty, insidious, lurking, perfidious, sneaky, subtle, treacherous, venomous, virulent, slinking, vipery
Antonyms: forthright, honest, upfront
Main Entry: subtle
Part of Speech: adjective
Definition: clever, cunning
Synonyms: analytical, artful, astute, complex, crafty, deep, designing, detailed, devious, dexterous, exacting, foxy, insidious, intriguing, keen, penetrating, perceptive, precise, scheming, shrewd, skillful, sly, wily, analytic, guileful, ratiocinative
Antonyms: forthright, honest, open
Main Entry: tricky
Part of Speech: adjective
Definition: deceptive, sly
Synonyms: artful, astute, cagey, catchy, clever, crafty, cunning, deceitful, deep, delusive, devious, dishonest, foxy, greasy*, insidious, intelligent, keen, misleading, scheming, shady, sharp, shifty, shrewd, slick*, slippery*, smooth, subtle, treacherous, wily, wry, delusory, guileful, streetwise, witted
Antonyms: aboveboard, frank, honest
Main Entry: deep
Part of Speech: adjective
Definition: scheming, devious
Synonyms: acute, artful, astute, canny, crafty, cunning, designing, foxy, insidious, intriguing, keen, knowing, sharp, shrewd, sly, tricky, wily, contriving, guileful, plotting
Antonyms: aboveboard, artless, open
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