In a manner characterized by flattery, excessive agreement, or fawning behavior to please others.
From 'assentator' (flatterer, from Latin 'assentator') + '-ily' (adverbial suffix). Latin 'assentari' means 'to agree with,' from 'ad-' (to) + 'sentire' (to feel). Over time, the meaning shifted to describe insincere agreement.
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