The Collaborative International Dictionary of English v.0.48:

Cavilous \Cav"il*ous\ or Cavillous \Cav"il*lous\, a. [L.
   cavillosus.]
   Characterized by caviling, or disposed to cavil; quibbing.
   [R.] -- Cav"il*ous*ly, adv. [R.] -- Cav"il*ous*ness, n.
   [R.]
   [1913 Webster]