The Collaborative International Dictionary of English v.0.48:

Perfunctory \Per*func"to*ry\ (p[~e]r*f[u^][ng]k"t[-o]*r[y^]), 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; a perfunctory greeting. --Macaulay.
      [1913 Webster]

   2. Hence: Mechanical; indifferent; listless; careless.
      "Perfunctory in his devotions." --Sharp.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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), perfunctory]
    2: as a formality only; "a one-candidate pro forma election"
       [syn: pro forma, perfunctory]