Source : Webster's Revised Unabridged Dictionary (1913)

Inconsideration \In`con*sid`er*a"tion\, n. [L. inconsideratio:
   cf. F. inconsid['e]ration.]
   Want of due consideration; inattention to consequences;
   inconsiderateness.

         Blindness of mind, inconsideration, precipitation.
                                                  --Jer. Taylor.

         Not gross, willful, deliberate, crimes; but rather the
         effects of inconsideration.              --Sharp.

Source : WordNet®

inconsideration
     n : the quality of failing to be considerate of others [syn: {inconsiderateness},
          {thoughtlessness}] [ant: {consideration}, {consideration}]