Chiefly of a person: discontented, dissatisfied; (now) esp. actively discontented; unwilling to acquiesce in the established ideas or practices…

= malcontent, adj.

Alienated from or dissatisfied with a person or thing; spec. disenchanted with or hostile to an established system of organization, authority…

Opposed to the principles on which society is constituted. Also, spec. in Sociol., pertaining to a class of persons or actions devoid of or…

Disagreeing in political matters; voicing political dissent, usually in a totalitarian state.