In a way that is extremely silly, absurd, or deserving of mockery or laughter.
From 'ridiculous,' which derives from Latin 'ridiculosus' (worthy of laughter), from 'ridere' (to laugh). The '-ly' suffix converts the adjective to an adverb.
Latin 'ridere' (to laugh) is the root of a whole family of words—'ridicule,' 'derisive,' 'ridiculous'—all spinning from the basic human action of laughing at something.
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