Austere (adjective) – simple, serious and saving money, without luxury

Austerely (adverb) – in a way that is simple, serious and saves money

Austerity/austereness (noun) – keeping things simple, serious and cheap

Living austere 

Here are some examples of how you can use austere:

She remembered old school camps where dinner was austere with boiled potatoes, sausages and vegetables without sauce.

Most monks lead an austere life.

The school building was furnished austerely with plastic chairs and tables; there were no posters on the walls.

He was dressed in an austere black suit.

Is great art born from austereness?

How can the government’s austerity policy stimulate the economy?