bringing or tending to bring ruin
; destructive; disastrous: a ruinous war.
fallen into ruin
; dilapidated: a ruinous house.
consisting of ruins
: a ruinous city from antiquity.
Origin: 1350–1400; Middle English ruynouse Related forms
< Latin ruīnōsus,
equivalent to ruīn
+ -ōsus -ous
1. calamitous, ravaging, devastating, catastrophic.