The Collaborative International Dictionary of English v.0.48:

Quarrellous \Quar"rel*lous\, a. [OF. querelous, F. querelleux,
   L. querulosus and querulus, fr. queri to complain. See 2d
   Quarrel.]
   Quarrelsome. [Obs.] [Written also quarrellous.] --Shak.
   [1913 Webster]