insincere

adjective
🔊/ˌɪnsɪnˈsɪə(r)/
🔊/ˌɪnsɪnˈsɪr/
(disapproving)
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  1. saying or doing something that you do not really mean or believe不诚恳的;不真心的
    • an insincere smile虚情假意的微笑
    opposite sincere
    Word Originmid 17th cent.: from Latin insincerus, from in- ‘not’ + sincerus ‘sincere’.