IPA: /pərˈfʌŋk.tər.ɪ.li/
KK: /pərˈfʌŋk.tər.ɪ.li/
In a way that shows little interest or effort, often done as a routine or duty without care for quality.
She completed the task perfunctorily, barely paying attention to the details.
Perfunctorily → It is formed from "per-" (meaning through or thoroughly) and "functorius" (from Latin, meaning performing or functioning). The word "perfunctorily" means to do something in a routine or superficial manner, as if merely performing a function without care or attention.
Think of doing something 'thoroughly' ('per-') but in a way that is just 'performing' ('functorius') without real engagement — that's why perfunctorily means doing something in a careless or routine manner.
No commonly confused words.