abstemious; austere; self-denying
Describes a lifestyle, attitude, or person that avoids indulgence and luxury, often with a disciplined or moral tone.
He leads an abstemious life.
The monk's austere training is famous.
He leads a monk-like, austere lifestyle.
He chose to give up his wealth and live austerely.
She's a very abstemious person who never eats sweets at all.