/ ˌɪnsɪnˈsɪə(r); NAmE -ˈsɪr/ adjective
( disapproving ) saying or doing sth that you do not really mean or believe :
an insincere smile
OPP sincere
► in·sin·cere·ly adverb
► in·sin·cer·ity / ˌɪnsɪnˈserəti; NAmE / noun [ U ]:
She accused him of insincerity.
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WORD ORIGIN
mid 17th cent.: from Latin insincerus , from in- not + sincerus sincere.