insincere
[adjective]
Synonyms: deceitful, dishonest, disingenuous, duplicitous, false, hollow, hypocritical, lying, two-faced, untruthful

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Antonyms: sincere
Contrasted words: candid, frank, open, plain, direct, forthright, straight, straightforward
Related Words: deceitful, dishonest, lying, mendacious, untruthful, shifty, slippery, tricky

[TahlilGaran] English Synonym Dictionary ▲

in‧sin‧cere /ˌɪnsɪnˈsɪə◂ $ -ˈsɪr◂/ adjective
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 /ˌɪnsɪnˈserəti, ˌɪnsɪnˈserɪti/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲