ruinous.
Causing ruin; destructive, calamitous.
Meaning & usage
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.
Where this word comes from
From Middle English ruynous, from Old French ruinos, ruineus, from Latin ruīnōsus. By surface analysis, ruin + -ous.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.