1. (adj) sincere
open and genuine; not deceitful
Synonyms: earnest, solemn
Antonyms: unctuous, oily, obsequious, hypocritical, frivolous, feigned, soapy, specious, sycophantic, fulsome, dissimulative, toadyish, buttery, oleaginous, bootlicking, fawning, false, plausible, smarmy, meretricious, insincere, gilded
2. (adj) earnest, sincere, solemn
characterized by a firm and humorless belief in the validity of your opinions
Synonyms: dear, heartfelt, businesslike, sincere, grave, sedate, earnest, sober, devout, solemn
Antonyms: frivolous, unctuous, fulsome, insincere, specious, fawning, hypocritical, buttery, oleaginous, obsequious, feigned, toadyish, false, meretricious, bootlicking, gilded, dissimulative, soapy, smarmy, oily, sycophantic, plausible
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Synonyms and Antonyms of sincere 
