Meaning of “ruinous” in the English Dictionary

"ruinous" in British English

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

"ruinous" in American English

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ruinousadjective [ not gradable ]

us /ˈru·ɪ·nəs/

causing permanent and severe harm:

ruinous costs

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

"ruinous" in Business English

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ruinousadjective

uk /ˈruːɪnəs/ us

causing great harm or destruction:

The bank had capital to spare, which they lost in a series of ruinous takeovers.
be ruinous to sth The proposed bill is ruinous to the home building industry.
ruinously
adverb

(Definition of “ruinous” from the Cambridge Business English Dictionary © Cambridge University Press)