8
unreal(adjective, fake, counterfeit, fantastic, sham)
8
untrue(adjective, fake, counterfeit, dishonest, sham)
8
untrustworthy(adjective, false, dishonest, cunning, deceitful)
8
untruthful(adjective, fake, false, counterfeit, dishonest)
7
bogus(adjective, fake, counterfeit, sham, phony)
7
canting(adjective, smooth, offensive, coarse, excessive)
7
factitious(adjective, fake, unusual, strange, counterfeit)
7
faithless(adjective, dishonest, lying, misleading, hypocritical)
7
oily(adjective, smooth, offensive, coarse, excessive)
7
spurious(adjective, fake, false, counterfeit, dishonest)
7
wily(adjective, false, dishonest, cunning, deceitful)
6
cunning(adjective, false, dishonest, deceitful, lying)
6
dishonorable(adjective, dishonest)
6
double(adjective, dishonest, deceitful, lying, hypocritical)
6
evasive(adjective, dishonest, deceitful, shrewd, crafty)
6
imitative(adjective, fake, artificial)
6
phoney orphony
6
scheming
6
slimy(adjective, smooth, offensive, coarse, excessive)
6
underhanded(adjective, false, dishonest, cunning, deceitful)
10 years ago|19k views|share |citing 
APASmart Define. (2016). insincere thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/insincere/thesaurus/synonyms
ChicagoSmart Define. 2016. "insincere thesaurus" https://smartdefine.org/insincere/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, insincere thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/insincere/thesaurus/synonyms>.
MLASmart Define. "insincere thesaurus" 14 March 2016. Web. 29 September 2026. <https://smartdefine.org/insincere/thesaurus/synonyms>