The Collaborative International Dictionary of English v.0.48:

Wrongous \Wron"gous\, a. [Cf. OE. wrongwis. See Wrong, and cf.
   Righteous.]
   [1913 Webster]
   1. Constituting, or of the nature of, a wrong; unjust;
      wrongful. [R.]
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   2. (Scots Law) Not right; illegal; as, wrongous imprisonment.
      --Craig.
      [1913 Webster]