In a dull manner; without brightness, sharpness, liveliness, or interest.
From 'dull' + '-ly' (adverb suffix from Old English '-lice'). The '-ly' marker is one of the most productive suffixes in English for creating adverbs.
Every adverb ending in '-ly' shows English's genius for modification—you can turn almost any adjective into an adverb just by adding a few letters, letting you describe actions with precision.
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