Mulish and Self-indulgent

Mulish adjective - Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion.

Self-indulgent and mulish are semantically related. In some cases you can use "Self-indulgent" instead an adjective "Mulish".

Self-indulgent adjective - Given to or marked by excessive gratification of one's desires.

Mulish and self-indulgent are semantically related. Sometimes you can use "Mulish" instead an adjective phrase "Self-indulgent".