Source : Webster's Revised Unabridged Dictionary (1913)

Irresolute \Ir*res"o*lute\, a. [Pref. ir- not + resolute: cf. F.
   irr['e]solu, L. irresolutus not loosened.]
   Not resolute; not decided or determined; wavering; given to
   doubt or irresolution.

         Weak and irresolute is man.              --Cowper.

   Syn: Wavering; vacillating; undetermined; undecided;
        unsettled; fickle; changeable; inconstant. --
        {Ir*res"o*lute*ly}, adv. -- {Ir*res"o*lute*ness}, n.

Source : WordNet®

irresolute
     adj 1: uncertain how to act or proceed; "the committee was timid
            and mediocre and irresolute" [ant: {resolute}]
     2: lacking decisiveness of character; unable to act or decide
        quickly or firmly; "stood irresolute waiting for some
        inspiration" [syn: {hesitant}, {hesitating}]