Source : Webster's Revised Unabridged Dictionary (1913)

Perfunctory \Per*func"to*ry\, a. [L. perfunctorius, fr.
   perfunctus dispatched, p. p. of perfungi to discharge,
   dispatch; per (see {Per}) + fungi to perform. See
   {Function}.]
   1. Done merely to get rid of a duty; performed mechanically
      and as a thing of rote; done in a careless and superficial
      manner; characterized by indifference; as, perfunctory
      admonitions. --Macaulay.

   2. Hence: Mechanical; indifferent; listless; careless.
      ``Perfunctory in his devotions.'' --Sharp.

Source : WordNet®

perfunctory
     adj 1: hasty and without attention to detail; not thorough; "a
            casual (or cursory) inspection failed to reveal the
            house's structural flaws"; "a passing glance";
            "perfunctory courtesy" [syn: {casual}, {cursory}, {passing(a)}]
     2: as a formality only; "a one-candidate pro forma election"
        [syn: {pro forma}]