I. ˌmal-kən-ˈtent noun
Date: 1581
: a discontented person:
a. : one who bears a grudge from a sense of grievance or thwarted ambition
b. : one who is in active opposition to an established order or government : rebel
II. adjective
Etymology: Middle French, from mal- + content content
Date: 1586
: dissatisfied with the existing state of affairs : discontented