Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: sincerus 'clean, pure'

sincere

adjective
     
sin‧cere
1 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
2 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.

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