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]

WordNet (r) 3.0 (2006):

mutinous
    adj 1: disposed to or in a state of mutiny; "the men became
           mutinous and insubordinate"
    2: consisting of or characterized by or inciting to mutiny;
       "mutinous acts"; "mutinous thoughts"; "a mutinous speech"

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "mutinous":
   alienated, at odds, averse, breakaway, contumacious, cursory,
   defiant, differing, disaffected, disagreeing, disinclined,
   disobedient, extreme, extremistic, factious, forced, fractious,
   headstrong, heady, indisposed, indocile, insubordinate, insurgent,
   insurrectionary, involuntary, irresponsible, lawless, licentious,
   mutineering, obstinate, opposed, perfunctory, rampant, rebel,
   rebellious, recalcitrant, refractory, reinless, resistant,
   revolutional, revolutionary, riotous, seditionary, seditious,
   self-willed, subversive, sulky, sullen, traitorous, treasonable,
   turbulent, unaccountable, unbridled, unchecked, unconsenting,
   uncontrollable, uncontrolled, uncurbed, undisciplined,
   ungovernable, ungoverned, unmanageable, unreined, unrestrained,
   unruly, unwilling, wildcat, willful