Tra từ sincere - Từ điển Oxford Advanced Learner 8th

sin·cere [sincere sincerer sincerest] BrE [sɪnˈsɪə(r)] NAmE [sɪnˈsɪr] adjective (superlative sin·cerest, no comparative)
1. (of feelings, beliefs or behaviour)showing what you really think or feel
Syn: ↑genuine
•a sincere attempt to resolve the problem
•sincere regret
• Please accept our sincere thanks.
•a sincere apology
2. (of a person)saying only what you really think or feel
Syn: ↑honest
• He seemed sincere enough when he said he wanted to help.
•~ in sth She is never completely sincere in what she says about people.
Opp: ↑insincere
Derived Word: ↑sincerity

Word Origin:
mid 16th cent. (also in the sense ‘not falsified, unadulterated’): from Latin sincerus ‘clean, pure’.

Thesaurus:
sincere adj.
1. (approving)
•I'd like to express our sincere gratitude.
genuine • • real • • deep • • heartfelt • • from the heart • • wholehearted •
Opp: insincere
sincere/genuine about sth
sincere/genuine/real/deep/heartfelt sympathy/concern
sincere/genuine/real/deep affection/respect/regret
Sincere or genuine? Sincere is more likely to be used by sb about their own feelings and intentions; genuine is more likely to be used to express a judgement on sb else's feelings and intentions:
•Please accept our sincere apologies.
✗ Please accept our genuine apolgies.:
•He made a genuine attempt to improve the situation.
2. (approving)
•He seemed sincere in his offer of help.
approving truthful • • open • • straightforward • |often approving honest • • frank • • candid •
Opp: insincere, Opp: hypocritical
sincere/truthful/open/straightforward/honest/frank/candid about sth
sincere/honest/frank/candid in your views/criticism, etc.
a/an sincere/truthful/open/honest person

Example Bank:
•Her protests seemed sincere enough.
•We offer our most sincere apologies.
•his refusal to be sincere about his feelings
•painfully sincere declarations of love
•the warm, deeply sincere note in her voice
•He insisted that they were making a sincere attempt to resolve the problem.
•I would like to express my sincere gratitude for your care and concern during this past week.
•Please accept our sincere apologies.
•You need to make a sincere apology to them.