Meaning of “ludicrous” in the English Dictionary

"ludicrous" in British English

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ludicrousadjective

uk /ˈluː.dɪ.krəs/ us /ˈluː.də.krəs/
ludicrously
adverb uk /ˈluː.dɪ.krəs.li/ us /ˈluː.də.krəs.li/

It's a beautiful dress, but it's ludicrously (= unreasonably) expensive.
ludicrousness
noun [ U ] uk /ˈluː.dɪ.krəs.nəs/ us /ˈluː.də.krəs.nəs/

(Definition of “ludicrous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ludicrous" in American English

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ludicrousadjective

us /ˈlu·dɪ·krəs/

ridiculous or foolish; unreasonable or unsuitable:

Some stories that initially seemed ludicrous turned out to be true.

(Definition of “ludicrous” from the Cambridge Academic Content Dictionary © Cambridge University Press)