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.]
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.
Hence: Mechanical; indifferent; listless; careless.
in his devotions."
© Webster 1913.