The Collaborative International Dictionary of English v.0.48:

malcontent \mal"con*tent`\, a. [F., fr. mal ill + content. See
   Malice, Content.]
   discontented; uneasy; dissatisfied; especially, dissatisfied
   with the government. [Written also malecontent.]
   [1913 Webster]

         The famous malcontent earl of Leicester. --Milner.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Malcontent \Mal"con*tent`\, n. [F. malcontent.]
   One who discontented; especially, a discontented subject of a
   government; one who expresses his discontent by words or
   overt acts. --Spenser. --Berkeley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

malcontent
    adj 1: discontented as toward authority [syn: disaffected,
           ill-affected, malcontent, rebellious]
    n 1: a person who is discontented or disgusted