01 a. Causing, or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.
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1.
Causing, or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.“After a night of storm so ruinous.” — Milton.
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2.
Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.
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3.
Composed of, or consisting in, ruins.“Behold, Damascus . . . shall be a ruinous heap.” — Isa. xvii. 1.
Syn.
Dilapidated; decayed; demolished; pernicious; destructive; baneful; wasteful; mischievous.