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Old English fūl (inherited)
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Old English fūlian (inherited)
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Middle English foul (inherited)
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Middle English foulen (inherited)
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Middle English fulen (mention)
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Proto-Germanic *fūlaz (inherited)
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Ancient Greek φαῦλος (cognate)
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Proto-Indo-European *puH- (root)
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Proto-Indo-European *puH- (derived)
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Cimbrian baul (cognate)
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Luxembourgish faul (cognate)
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Old Norse fúll (cognate)
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Portuguese falta (link)
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Sanskrit पूयति (cognate)
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Swedish foula (derived)
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Yiddish פֿויל (cognate)