/ ˈluːdɪkrəs; NAmE / adjective
unreasonable; that you cannot take seriously
SYN absurd , ridiculous :
a ludicrous suggestion
It was ludicrous to think that the plan could succeed.
► ludi·crous·ly adverb :
ludicrously expensive
► ludi·crous·ness noun [ U ]
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WORD ORIGIN
early 17th cent. (in the sense sportive, intended as a jest ): from Latin ludicrus (probably from ludicrum stage play) + -ous .