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Old English stīf (inherited)
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Middle English stiff (inherited)
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Middle English stiffe (mention)
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Middle English stif (mention)
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West Frisian stiif (cognate)
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Proto-Germanic *stīfaz (inherited)
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Proto-Indo-European *steypós (inherited)
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Norwegian Bokmål stiv (cognate)
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Luxembourgish steif (cognate)
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Latvian stīvs (cognate)
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Saterland Frisian stieuw (cognate)