austere, severe, stark, stern -- (severely simple; "a stark interior")
austere, stern -- (of a stern or strict bearing or demeanor; forbidding in aspect; "an austere expression"; "a stern face")
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")
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