Relating to bad language, foul speech, or obscene words; characterized by the use of vulgar or coarse language.
From Greek kakos (bad) and logos (word, language), with the suffix -ical. It forms an adjective describing speech or language that is crude, vulgar, or offensive.
Medieval monks used 'cacological' in religious texts to scold people for swearing—it's the fancy theological way to say 'you have a potty mouth!'
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