Nonindulgent is a term that refers to someone who is strict, austere, or unyielding. Antonyms for this term include indulgent, lenient, permissive, and lenient. An indulgent person is one who is relaxed, easygoing, and tolerant, while a lenient person is someone who is compassionate, flexible, and forgiving. A permissive individual allows others to do as they please, giving them the freedom to make their own choices. On the other hand, someone who is nonindulgent can be categorized as being strict, severe, inflexible, or rigid. These antonyms are useful when describing various behaviors, attitudes, or strategies, and they can be used interchangeably to match different contexts and situations.