In an apish manner; in a silly, foolish, or ape-like way.
From 'apish' (adjective) plus the adverbial suffix '-ly,' forming the standard English pattern for converting adjectives to adverbs. Attested since the 16th century.
Notice how English lets you stack suffixes—'ape' → 'apish' → 'apishly'—creating a chain of meaning that gets more specific with each step, like linguistic DNA!
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