ruinous

From Middle English ruynous, from Old French ruinos, ruineus, from Latin ruīnōsus; surface analysis ruin +‎ -ous.

• IPA^(key): /ˈɹuː.ɪnəs/

ruinous (comparative more ruinous, superlative most ruinous)

1. Causing ruin; destructive, calamitous
2. Extremely costly; so expensive as to cause financial ruin.

   They were forced to completely replace the roof at ruinous expense.

3. Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.

• (characterized by ruin): See Thesaurus:ramshackle

• ruinously
• ruinousness

• ruinous in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• ruinous in The Century Dictionary, New York, N.Y.: The Century Co., 1911
• ruinous at OneLook Dictionary Search

• urinous