Longman Dictionary of Contemporary English homepage

insincere

 adjective
     
in‧sin‧cere
pretending to be pleased, sympathetic etc, especially by saying nice things, but not really meaning what you say:
an insincere smile
an offer which she knew to be impractical and insincere
—insincerely adverb
—insincerity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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