demanding
Spartan
Spartanic
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authoritarian
binding
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caustic
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double-edged
dour
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exacting
exigent
fierce
grim
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harsh
incisive
inclement
ironhanded
keen
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mordacious
mordant
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stabbing
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stricture
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comprehensive
drastic
effectual
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explicit
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mandatory
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salutary
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statutory
contingent