Definition: coming from honest feelings
Part of Speech: Adjective
Synonym(s): heartfelt, genuine
Antonym(s): insincere, fake, devious
1. I accepted Frank’s apology because it sounded sincere.
2. Because my son’s interest in skateboarding is sincere, I’m willing to pay a lot of money for a quality board.
3. If you’re not sincere in your efforts to quit drinking, then you won’t be able to stop.