adj. 25B6; adjective
a ruinous trade war : DISASTROUS, devastating, catastrophic, calamitous, crippling, crushing, damaging, destructive, harmful; costly.
ruinous interest rates : EXTORTIONATE, exorbitant, excessive, sky-high, outrageous, inflated; Brit. over the odds; informal criminal, steep.
a ruinous chapel. : See ruined .