apologetic adj. making an apology; expressing regret or offering an excuse for a fault or failure: an apologetic reply. defending by speech or writing.
apologetics n. branch of theology that deals with the rational defense of a religious faith.
apologist n. person who defends an idea, belief, religion, etc., in speech or writing.
apologia n. statement in defense or justification of an idea, belief, religion, etc.;
apologize v.i., , -gized, -gizing . make an apology; express regret; acknowledge a fault; offer an excuse: She apologized for hurting my feelings. defend an idea, belief, religion, etc., in speech or writing.