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Use "foulest" in a sentence
"“Shatm” — abuse, generally couched in foulest language with especial reference to the privy parts of female relatives."
"Buttocks of boys, and woke at morn in foulest mess"
"Old men growled in their beards, and Mrs. Merriwether who feared nothing rose slightly in her carriage and said clearly: “Speculator!” in a tone that made the word the foulest and most venomous of epithets."