In a manner resembling or characteristic of a cook; in a cooking-related or kitchen-like way.
From 'cookish' (resembling a cook) plus '-ly,' the adverbial suffix. This creates an adverb from an adjective following standard English word formation patterns.
When we stack suffixes like 'cook-ish-ly,' we're building words in real time—English speakers do this intuitively, understanding the meaning instantly even for words they've never seen before, which is remarkable flexibility in the language.
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