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ruinous

[roo-uh-nuh s] /ˈru ə nəs/
adjective
1.
bringing or tending to bring ruin; destructive; disastrous:
a ruinous war.
2.
fallen into ruin; dilapidated:
a ruinous house.
3.
consisting of ruins:
a ruinous city from antiquity.
Origin of ruinous
1350-1400
1350-1400; Middle English ruynouse < Latin ruīnōsus, equivalent to ruīn(a) ruin + -ōsus -ous
Related forms
ruinously, adverb
ruinousness, noun
nonruinous, adjective
nonruinously, adverb
nonruinousness, noun
unruinous, adjective
unruinously, adverb
unruinousness, noun
Synonyms
1. calamitous, ravaging, devastating, catastrophic.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ruinous

ruinous

/ˈruːɪnəs/
adjective
1.
causing, tending to cause, or characterized by ruin or destruction: a ruinous course of action
Derived Forms
ruinously, adverb
ruinousness, 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
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Word Origin and History for ruinous
adj.

late 14c., "going to ruin," from Old French ruinos (Modern French ruineux) or directly from Latin ruinosus "tumbling down, going to ruin," from ruina (see ruin (n.)). Meaning "causing ruin" is from mid-15c. Related: Ruinously.

Online Etymology Dictionary, © 2010 Douglas Harper
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