Definition of “sincere” - English Dictionary

“sincere” in British English

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sincereadjective

uk /sɪnˈsɪər/ us /sɪnˈsɪr/

C1 (of a person, feelings, or behaviour) not pretending or lying; honest:

a sincere apology
He seems so sincere.
Opposite

(Definition of “sincere” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“sincere” in American English

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sincereadjective

us /sɪnˈsɪər/

(esp. of feelings, beliefs, opinions, or intentions) honest; not false or invented:

More than sincere words of support, we need action.
sincerity
noun [ U ] us /sɪnˈser·ɪ·t̬i/

She spoke with such sincerity, you had to believe her.

(Definition of “sincere” from the Cambridge Academic Content Dictionary © Cambridge University Press)