Definition of insincere adjective from the Oxford Advanced Learner's Dictionary

 

insincere

 adjective
adjective
BrE BrE//ˌɪnsɪnˈsɪə(r)//
 
; NAmE NAmE//ˌɪnsɪnˈsɪr//
 
(disapproving)
 
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saying or doing something that you do not really mean or believe an insincere smile opposite sincere Word Origin mid 17th cent.: from Latin insincerus, from in- ‘not’ + sincerus ‘sincere’.
See the Oxford Advanced American Dictionary entry: insincere