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Definition
sincere   Show phonetics
adjective
1 honest and saying or showing what you really feel or believe
He seems to be sincere.
Opposite insincere

2 sincere apologies/thanks, etc FORMAL used to add emphasis when you are expressing a feeling
The family wishes to express their sincere thanks to all the staff at the hospital.
sincerity   Show phonetics
noun [U]
No one doubted his sincerity.

The first and last word in dictionaries