10
deceptive(adjective, smooth, fake, false, counterfeit)
10
feigned(adjective, fake, unusual, counterfeit, true)
10
sham(noun, adjective, fake, false, counterfeit)
9
affected(adjective, smooth, fake, delicate, false)
9
artful
9
dissembling(adjective, smooth, false, dishonest, deceitful)
9
empty(adjective, worthless, ineffective, superficial, throwaway)
9
fraudulent(adjective, fake, false, counterfeit, dishonest)
9
lying(adjective, smooth, fake, false, counterfeit)
9
pretended(adjective, fake, false, counterfeit, true)
9
shifty(adjective, false, dishonest, cunning, deceitful)
9
slick(adjective, smooth, offensive, coarse, dishonest)
9
smarmy(adjective, smooth, offensive, coarse, excessive)
9
unctuous(adjective, smooth, false, deceitful, lying)
9
unnatural(adjective, fake, counterfeit, regular, hollow)
8
crooked(adjective, false, dishonest, deceitful, lying)
8
meretricious(adjective, fake, counterfeit, sham, phony)
8
pharisaic(adjective, hypocritical)
8
phony(adjective, fake, false, unusual, counterfeit)
8
sanctimonious(adjective, smooth, offensive, coarse, excessive)
10 years ago|19k views|share |citing 
APASmart Define. (2016). insincere thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/insincere/thesaurus/synonyms
ChicagoSmart Define. 2016. "insincere thesaurus" https://smartdefine.org/insincere/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, insincere thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/insincere/thesaurus/synonyms>.
MLASmart Define. "insincere thesaurus" 14 March 2016. Web. 28 September 2026. <https://smartdefine.org/insincere/thesaurus/synonyms>