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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Done merely to get rid of a duty; performed mechanically and as a thing of rote; done in a careless and superficial manner; characterised by indifference; as, perfunctory admonitions.

2. Hence: mechanical; indifferent; listless; careless. Perfunctory in his devotions.

Origin: L. Perfunctorius, fr. Perfunctus dispatched, p.p. Of perfungi to discharge, dispatch; per (see Per) _ fungi to perform. See Function.