The Collaborative International Dictionary of English v.0.48:

Outlaw \Out"law`\, v. t. [imp. & p. p. Outlawed; p. pr. & vb.
   n. Outlawing.] [AS. ?tlagian.]
   [1913 Webster]
   1. To deprive of the benefit and protection of law; to
      declare to be an outlaw. --Blackstone.
      [1913 Webster]

   2. To remove from legal jurisdiction or enforcement; as, to
      outlaw a debt or claim; to deprive of legal force. "Laws
      outlawed by necessity." --Fuller.
      [1913 Webster]

   3. To render illegal; to ban, prohibit, or proscribe under
      sanction of some penalty.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

outlawed \outlawed\ adj.
   1. contrary to or forbidden by law; banned; illicit; as, a
      member of an outlawed political party.

   Syn: illegitimate, illicit, outlaw(prenominal), unlawful.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

outlawed
    adj 1: contrary to or forbidden by law; "an illegitimate seizure
           of power"; "illicit trade"; "an outlaw strike"; "unlawful
           measures" [syn: illegitimate, illicit, outlaw(a),
           outlawed, unlawful]