- 1(of feelings, beliefs, or behavior) showing what you really think or feel synonym genuine a sincere attempt to resolve the problem sincere regret Please accept our sincere thanks. a sincere apology
- 2(of a person) saying only what you really think or feel synonym honest He seemed sincere enough when he said he wanted to help. sincere in something She is never completely sincere in what she says about people. opposite insincere
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NAmE//sɪnˈsɛrət̮i//noun [uncountable] The sincerity of his beliefs is unquestionable. She spoke with total sincerity. I can say in all sincerity that I knew nothing of these plans.