perfunctory
adj.adj. done quickly and without real interest or care. You do something this way only because you have to, not because you want to do a good job.
adj. carried out with a minimum of effort or reflection. Attributive or predicative adjective typically describing actions performed as a matter of routine or duty.
He gives a perfunctory nod as he walks past.
The inspector performed a perfunctory check of the building, missing several obvious repairs that were needed.
The candidate offered only a perfunctory apology during the interview, failing to address the deeper concerns raised by the committee regarding his previous professional conduct.
From Late Latin perfunctōrius (“careless, negligent”), from the past participial stem of perfungor, perfunct- (“perform, carry through”), from per- + fungor.