ingratiation

/ɪnˌɡreɪʃiˈeɪʃən/
noun
  1. The act of trying to gain favor or approval through flattery or pleasant behavior.
    • She saw through his ingratiation and knew he was only being nice to get something.
    • Ingratiation is a common tactic in politics, but it often backfires if it seems too obvious.
    • His constant ingratiation with the manager annoyed the other employees.
Antonyms
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