Perfunctory (adjective)

Done without real interest, feeling, or effort; cursory.

Origin:

From the late 16th century, perfunctory is derived from the latin word "perfunctorius" which means to perform one"s duty. it was used first in english in the sense of performing one"s duty in a cursory or superficial manner.

Examples:

1. He gave a perfunctory nod to the crowd.
2. She carried out her duties in a perfunctory manner.
3. The report was perfunctory and lacked detail.
4. His apologies were perfunctory and insincere.
5. The teacher gave a perfunctory explanation of the topic.