Source : Webster's Revised Unabridged Dictionary (1913)

Unwarranted \Un*war"rant*ed\, a.
   Not warranted; being without warrant, authority, or guaranty;
   unwarrantable.

Source : WordNet®

unwarranted
     adj 1: incapable of being justified or explained [syn: {indefensible},
             {insupportable}, {unjustifiable}, {unwarrantable}]
     2: without a basis in reason or fact; "baseless gossip"; "the
        allegations proved groundless"; "idle fears"; "unfounded
        suspicions"; "unwarranted jealousy" [syn: {baseless}, {groundless},
         {idle}, {unfounded}]
     3: lacking justification or authorization; "unreasonable
        searches and seizures"; "desire for undue private profit";
        "unwarranted limitations of personal freedom" [syn: {undue},
         {unjustified}]