malcontent /(?)/

mal·con·tent

malcontent

a.
  1. discontented; uneasy; dissatisfied; especially, dissatisfied with the government.
    The famous malcontent earl of Leicester.
    — Milner.

Malcontent

n.
  1. One who discontented; especially, a discontented subject of a government; one who expresses his discontent by words or overt acts.