- (a.) Causing or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.
- (a.) Characterized by ruin; ruined; dilapidated; as, an edifice, bridge or wall in a ruinous state.
- (a.) Composed of or consisting in, ruins.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). ruinous. Retrieved September 21, 2026, from http://smartdefine.org/ruinous/definitions/2056989 |
| Chicago | Webster's. 2011. "ruinous" http://smartdefine.org/ruinous/definitions/2056989 (accessed September 21, 2026). |
| Harvard | Webster's 2011, ruinous, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/ruinous/definitions/2056989>. |
| MLA | Webster's. "ruinous" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/ruinous/definitions/2056989> |