defying or resisting some established authority, government, or tradition; insubordinate; inclined to rebel.
pertaining to or characteristic of rebels or rebellion
(of things) resisting treatment; refractory.
Origin: 1400–50; late Middle English Related forms
< Medieval Latin rebelliōsus,
equivalent to Latin rebelli
+ -ōsus -ous
1. defiant, insurgent, mutinous, seditious, rebel, refractory, disobedient, contumacious.