As a noun apologist
is one who makes an apology.
As an adjective complacent is
uncritically satisfied with oneself or one's achievements; smug.
One who makes an apology.
One who speaks or writes in defense of a faith, a cause, or an institution.
* (one who makes an apology) apologizer, apologiser
Uncritically satisfied with oneself or one's achievements; smug.
Apathetic with regard to an apparent need or problem.
* (term) should not be confused with its homophone, complaisant.