Etymology
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ruinous (adj.)

late 14c., "going to ruin, falling to ruin," from Old French ruinos (Modern French ruineux) and directly from Latin ruinosus "tumbling down, going to ruin," from ruina (see ruin (n.)). Meaning "causing ruin, tending to bring ruin" is from mid-15c.; by 1817 specifically as "excessively expensive." Related: Ruinously; ruinousness.

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Definitions of ruinous

ruinous (adj.)
extremely harmful; bringing physical or financial ruin;
a ruinous course of action
Synonyms: catastrophic
ruinous (adj.)
causing injury or blight; especially affecting with sudden violence or plague or ruin;
a ruinous war
Synonyms: blasting
From wordnet.princeton.edu

Dictionary entries near ruinous

rugby

rugged

rugrat

ruin

ruination

ruinous

rulable

rule

ruler

ruling

ruly