Insincere
Definition 1 of 2

Emotional Disconnect
Shows lack of real emotion behind words.

Despite his cheers, his insincere tone revealed his disinterest.
Hidden Motives
May imply a hidden agenda or dishonest intentions.

Her insincere flattery was a ploy to win the competition.
Cultural Perception
Perceived differently across cultures; be mindful of this.

His insincere farewell was polite in his culture but rude in mine.
Compare with
counterfeitdeceitfuldishonestduplicitousfalsefictitioushypocriticalphoney
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