"austere" in the adjective sense
1. austere, severe, stark, stern
severely simple
"a stark interior"
2. austere, stern
of a stern or strict bearing or demeanor forbidding in aspect
"an austere expression"
"a stern face"
3. ascetic, ascetical, austere, spartan
practicing great self-denial
"Be systematically ascetic...do...something for no other reason than that you would rather not do it"- William James
"a desert nomad's austere life"
"a spartan diet"
"a spartan existence"
Source: WordNet® (An amazing lexical database of English)
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