Source : Webster's Revised Unabridged Dictionary (1913)

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.