ascetical vs austere

ascetical and austere both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ascetical	No	Yes	No	No
austere	No	Yes	No	No

As adjectives, ascetical and austere are synonyms defined as:

Other synonyms of ascetical include ascetic, spartan.

ascetical (adjective)	austere (adjective)
pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline	practicing great self-denial
practicing great self-denial	of a stern or strict bearing or demeanor; forbidding in aspect
	severely simple