Open English Wordnet
Adjectives
(s)austere, sternof a stern or strict bearing or demeanor; forbidding in aspect“an austere expression”,
“a stern face” (s)ascetic, ascetical, austere, spartanpracticing 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”