Mutinous, a.
Etymology: [See Mutiny.]
Disposed to mutiny; in a state of mutiny; characterized by mutiny; seditious; insubordinate. The city was becoming mutinous. Macaulay. -- Mu"ti*nous*ly, adv. -- Mu"ti*nous*ness, n.
Shades of meaning
Fernald has no entry of its own for mutinous; he lists it under rebellious, restive.
Where he writes about it:
Insubordinate applies to the disposition to resist and resent control as such; mutinous, to open defiance of authority, especially in the army, navy, or merchant marine. — from rebellious