Antonyms for sincere

Antonyms of adj sincere

2 senses of sincere

Sense 1:

sincere (vs. insincere)

insincere (vs. sincere)
bootlicking, fawning, obsequious, sycophantic, toadyishbuttery, fulsome, oily, oleaginous, smarmy, soapy, unctuousdissimulativefalsefeignedgilded, meretricious, specioushypocriticalplausible

Sense 2:

earnest, sincere, solemn

INDIRECT (VIA serious) -> frivolous