[ roo-uh-nuhs ]
/ ˈru ə nəs /


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.

Words nearby ruinous

Origin of ruinous

1350–1400; Middle English ruynouse < Latin ruīnōsus, equivalent to ruīn(a) ruin + -ōsus -ous

OTHER WORDS FROM ruinous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for ruinous

British Dictionary definitions for ruinous

/ (ˈruːɪnəs) /


causing, tending to cause, or characterized by ruin or destructiona ruinous course of action

Derived forms of ruinous

ruinously, adverbruinousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012