The Collaborative International Dictionary of English v.0.48:

Irresolution \Ir*res`o*lu"tion\, n. [Cf. F. irr['e]solution.]
   Lack of resolution; lack of decision in purpose; a
   fluctuation of mind, as in doubt, or between hope and fear;
   irresoluteness; indecision; vacillation.
   [1913 Webster]

         Irresolution on the schemes of life which offer
         themselves to our choice, and inconstancy in pursuing
         them, are the greatest causes of all unhappiness.
                                                  --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

irresolution
    n 1: doubt concerning two or more possible alternatives or
         courses of action; "his indecision was only momentary but
         the opportunity was lost" [syn: indecision,
         indecisiveness, irresolution]
    2: the trait of being irresolute; lacking firmness of purpose
       [syn: irresoluteness, irresolution] [ant: firmness,
       firmness of purpose, resoluteness, resolution,
       resolve]