perfunctory
Pronunciation:
/pəˈfʌŋk.t(ə)ɹɪ//pɚˈfʌŋk.tɚ.i/adjective
Definitions
Done only to fulfil a duty, or in a careless or indifferent manner; performed mechanically and as a thing of rote.
Example: He did a perfunctory job cleaning his dad's car, finishing quickly but leaving a few spots still dirty.