only 1 use
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Definitioncatastrophic or extremely harmful; or badly damaged or decayed (like ancient ruins)
- Many of them looked to have been worked by hands, though now they lay tumbled and ruinous in a bleak, barren land.2.3 -- Book 2 Chapter 3 -- The Ring Goes South (63% in)
There are no more uses of "ruinous" in The Fellowship of the Ring.
Typical Usage (best examples)