(of an action) done as a duty or habit, without real interest, attention, or feeling a perfunctory nod/smile They only made a perfunctory effort.
NAmE//pərˈfʌŋktərəli//
adverb to nod/smile perfunctorily The guard glanced perfunctorily at her pass and let her through.See perfunctory in the Oxford Advanced Learner's DictionaryCheck pronunciation: perfunctory