1. (a.) Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; -- said of persons; also of speech, thought; etc.; as, insincere declarations.
2. (a.) Disappointing; imperfect; unsound.
Thesaurus Entries
Machiavellian, Tartuffian, Tartuffish, adulatory, affected, ambidextrous, apparently sound, artful, artificial, bland, blandishing, blarneying, buttery, cajoling, calculating, canting, casuistic, colorable, complimentary, courtierly, courtly, crafty, crooked, cunning, deceitful, deceptive, dishonest, disingenuous, dissembling, double, double-dealing, duplicitous, empty, evasive, fair-spoken, faithless, fallacious, FALSE, falsehearted, fawning, fine-spoken, flattering, forsworn, foxy, fulsome, goody, goody-goody, gushing, histrionic, holier-than-thou, hollow, honey-mouthed, honey-tongued, honeyed, hypocritical, illusive, insinuating, jesuitic, la-di-da, lying, maniere, mannered, mealymouthed, mendacious, obsequious, oily, oily-tongued, overacted, overdone, overrefined, oversubtle, perfidious, perjured, pharisaic, philosophistic, pietistic, pious, plausible, pretentious, sanctified, sanctimonious, scheming, self-righteous, shifty, slick, slimy, slippery, slobbery, sly, smarmy, smooth, smooth-spoken, smooth-tongued, sniveling, soapy, soft-soaping, sophistic, sophistical, specious, stagy, sycophantic, theatrical, tongue in cheek, treacherous, tricky, two-faced, uncandid, unctuous, underhanded, unfrank, ungenuine, unnatural, unserious, unsincere, untruthful, vulpine, wheedling, wily
