Flat adverb

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A flat adverb is an adverb that assumes the form of a related adjective, most often when words ending in -ly are used without the -ly. Though once quite common, flat adverbs have been largely phased out by their -ly counterparts. This shift owes to 18th-century grammarians who insisted that adverbs end in -ly. Nonetheless, flat adverbs are preferred in some cases, as in "take it easy" and "sleep tight".[1]


  1. "Drive Safe: In Praise of Flat Adverbs" with Emily Brewster, part of the "Ask the Editor" series at Merriam-Webster.com