Definition of insincere adjective from the Oxford Advanced American Dictionary

 

insincere

 adjective
adjective
NAmE//ˌɪnsɪnˈsɪr//
 
(disapproving)
 
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saying or doing something that you do not really mean or believe an insincere smile opposite sincere
insincerely
 
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adverb
insincerity
 
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NAmE//ˌɪnsɪnˈsɛrət̮i//
 
noun [uncountable] She accused him of insincerity.
See the Oxford Advanced Learner's Dictionary entry: insincere