English to English
1. open and genuine; not deceitful
he was a good man, decent and sincere|felt sincere regret that they were leaving|sincere friendship
2. Pure; unmixed; unadulterated.
3. 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