Open English Wordnet
Adjectives
(a)sincereopen and genuine; not deceitful“he was a good man, decent and sincere”,
“felt sincere regret that they were leaving”,
“sincere friendship” (s)earnest, sincere, solemncharacterized by a firm and humorless belief in the validity of your opinions“both sides were deeply in earnest, even passionate”,
“an entirely sincere and cruel tyrant”,
“a film with a solemn social message”