severe
adjective
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causing fear or anxiety by threatening great harmdangerous
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very bad in degree or extent“a severe worldwide depression”
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unsparing and uncompromising in discipline or judgment“a parent severe to the pitch of hostility- H.G.Wells”spartan
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intensely or extremely bad or unpleasant in degree or quality“severe pain”terrible
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severely simplestark
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very strong or vigoroushard