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The Collaborative International Dictionary
Ruinousness

Ruinous \Ru"in*ous\, a. [L. ruinosus: cf. F. ruineux. See Ruin.]

  1. Causing, or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.

    After a night of storm so ruinous.
    --Milton.

  2. Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.

  3. Composed of, or consisting in, ruins.

    Behold, Damascus . . . shall be a ruinous heap.
    --Isa. xvii. 1.

    Syn: Dilapidated; decayed; demolished; pernicious; destructive; baneful; wasteful; mischievous. [1913 Webster] -- Ru"in*ous*ly, adv. -- Ru"in*ous*ness, n.

Wiktionary
ruinousness

n. The quality of being ruinous.