Словарь синонимов английского языка - insincere

(adj) hypocritical, dishonest, dissembling, deceptive, disingenuous, deceitful, untruthful, false, artificial, ungenuine, treacherous, perfidious, faithless, double-dealing, duplicitous, two-faced, Janus-faced, lying, mendacious, sly, Machiavellian, cunning, crafty, slick, foxy, vulpine, wily, artful, evasive, shifty, dime-serving, unctuous, slimy, slippery, tricky, underhanded, crooked, Colloa phoney or ES also phony: From the first act I thought Iago insincere.