In a somewhat dull or boring manner; lacking brightness or interest in a mild way.
From 'dullish' (somewhat dull) + '-ly' (adverb suffix). 'Dull' comes from Old English 'dol' meaning slow-witted, evolving to mean lacking interest or brightness.
This word shows how English speakers can fine-tune emotions with the '-ish' suffix—'dullish' is more forgiving than just 'dull,' like saying someone's joke was 'kind of' boring rather than completely boring.
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