The Collaborative International Dictionary of English v.0.48:

Mutinous \Mu"ti*nous\, a. [See Mutiny.]
   Disposed to mutiny; in a state of mutiny; characterized by
   mutiny; seditious; insubordinate.
   [1913 Webster]

         The city was becoming mutinous.          --Macaulay.
   [1913 Webster] -- Mu"ti*nous*ly, adv. -- Mu"ti*nous*ness,
   n.
   [1913 Webster]