ruinously
Adverb
Meaning
in a ruinous manner or to a ruinous degree
Source: WordNetSynonyms
unfortunately
badly
adversely
fatally
ruinous
destructively
injuriously
malignly
balefully
cataclysmal
tragically
harmfully
brokenly
detrimentally
fatefully
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Antonyms
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Nothing's more exciting than a day in a studio with a string section - or more ruinously expensive. So it's good to feed that habit away from the band, especially if it means more experience for the next Radiohead string day.
He was finding it ruinously expensive to be rich.
ruinously high wages