/sɪn'sɪə(r); sɪn`sɪr/
adj
1 (of feelings or behaviour) not pretended; genuine （指感情或行为）真实的, 诚挚的
*sincere friendship, affection, dislike, disagreement, etc 诚挚的友谊、真诚的爱、真正的厌恶、实质的分歧
* It is my sincere belief that... 我确信...
* His was a sincere offer of help. 他真心实意愿意协助.
2 (of people) only saying things one really means or believes; straightforward （指人）诚实的, 直率的
*a sincere Christian 虔诚的基督教徒
* She wasn't entirely sincere when she said she liked me. 她说她喜欢我, 这话有些言不由衷.

adj
[Date: 1500-1600; Language: Latin;Origin: sincerus 'clean, pure']
a feeling, belief, or statement that is sincere is honest and true, and based on what you really feel and believe
= genuine
sincere thanks/thank you/gratitude
　I would like to say a sincere thank you to everyone who has helped and supported me.
　Please accept my sincere apologies .
　his sincere desire to find out the truth
someone who is sincere is honest and says what they really feel or believe
≠ insincere
　a warm-hearted, sincere man
sincere in
　They were obviously sincere in their beliefs.
　I wasn't sure that he was sincere in what he was saying.