Characterized by or involving excessive agreement, flattery, or servile compliance; given to fawning.
From Latin 'assentatorius,' from 'assentator' (flatterer). The suffix '-tory' (relating to) transforms the noun into an adjective describing the quality or nature of flattering agreement.
Medieval and Renaissance literature constantly criticized 'assentatory' behavior at court—writers saw it as moral weakness, the vice of never disagreeing or questioning authority, which made 'assentatory' a perfect word for calling out yes-men throughout history.
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