adjective

dissatisfied, especially with people in authority or a system of control.

a military plot by disaffected elements in the army

dissatisfied,disgruntled,discontented,malcontent,restless,frustrated,fed up,alienated,estranged,disloyal,rebellious,insubordinate,mutinous,seditious,renegade,insurgent,insurrectionary,dissident,up in arms,hostile,antagonistic,unfriendly