List of insincere synonyms and insincere related words.
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