Causing ruin; destructive, calamitous.
Extremely costly; so expensive as to cause financial ruin.
They were forced to completely replace the roof at ruinous expense.
Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.
From Middle English ruynous, from Old French ruinos, ruineus, from Latin ruīnōsus. By surface analysis, ruin + -ous.
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