Synonyms of ruinous in English:

ruinous


See US English definition of ruinous

See UK English definition of ruinous

See Spanish definition of ruinoso

adjective

1‘the spectre of a ruinous trade war loomed’

SYNONYMS
disastrous, devastating, catastrophic, calamitous, cataclysmic, crippling, crushing, dire, injurious, damaging, destructive, harmful
costly
ANTONYMS

beneficial

2‘lending money at ruinous interest rates’

SYNONYMS
extortionate, exorbitant, excessively high, sky-high, outrageous, inflated, more than can be afforded
British over the odds
informal criminal, steep

3‘a little to the west of the house is an old, ruinous chapel’

SYNONYMS
derelict, in ruins, ruined, gone to rack and ruin, dilapidated, tumbledown, ramshackle, broken-down, decrepit, in disrepair, falling to pieces, falling apart, crumbling, decaying, disintegrating
neglected, uncared-for
informal shambly
North American informal shacky
ANTONYMS

intact, well maintained