Lacking adverbs; a phrase or sentence that contains no adverbial words or modifiers.
From adverb plus the suffix -less meaning 'without.' This is a modern English construction following the productive pattern of adding -less to create adjectives meaning the absence of something.
Many of the best short sentences in literature are actually adverbless—think 'The cat sat on the mat'—which shows that you don't need adverbs to write powerfully, even though adverbs feel like they should be essential.
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