"forcible resistance of or revolt against constituted authority on the part of subordinates," especially "a revolt of soldiers or seamen against their commanding officers," 1560s, with noun suffix -y (4) + obsolete verb mutine "revolt" (1540s), from French mutiner "to revolt," from meutin "rebellious," from meute "a revolt, movement," from Vulgar Latin *movita "a military uprising," from fem. past participle of Latin movere "to move" (from PIE root *meue- "to push away"). The Mutiny on the Bounty took place in 1789.
word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."
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Definitions of mutinous from WordNet
disposed to or in a state of mutiny;
the men became mutinous and insubordinate
consisting of or characterized by or inciting to mutiny;