|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
They were obviously sincere in their beliefs.
I wasn't sure that he was sincere in what he was saying.