Synonyms of sincere

1. sincere (vs. insincere), bona fide, cordial, dear, devout, earnest, heartfelt, honest, genuine, true(prenominal), unfeigned, heart-whole, wholehearted, whole-souled, genuine#1, echt, honest#1, honorable, ingenuous#1, artless, real#1, existent, true: usage: open and genuine; not deceitful; "he was a good man, decent and sincere"; "felt sincere regret that they were leaving"; "sincere friendship"
2. earnest, sincere, solemn, serious (vs. frivolous): usage: characterized 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"