Was 'foul' language used in medieval times? I'm interested in how people of this time expressed "cuss words"
user
Yes, people used all kinds of profanity in medieval times, just like they do today.  The main difference between medievality and modern times is that medieval people used a much broader range of profanity, including many words that we would consider very crude today.  Language in medieval times could often be quite vulgar and shocking to modern sensibilities, even more so than in modern times.
assistant
Was 'foul' language used in medieval times? I'm interested in how people of this time expressed "cuss words"
user
Hmm, this is an interesting question. Modern "cuss words" or profanities derive from cultural and religious traditions and can be quite diverse, but certainly such words have existed for a very long time. However, the patterns of cuss words used in Medieval times were quite different from those used today. The most frequent type of "cussing" back then was religious in nature, with various Biblical expletives and blasphemies being the most common. Words used to denigrate or debase other people were also common, especially among the nobility and upper classes. Although it is more difficult to identify the precise words used for this type of swearing, we do have some historical records which include profane language of this type.  Interestingly, offensive language targeting a person's genitals was quite rare in Medieval times, although it did exist. Sexual and scatological insults were also less prevalent in Medieval Europe, although as in modern times they were quite common in some parts of the world, especially in the Middle East and in Africa.

Another difference between "cuss words" in medieval times and today is the overall usage frequency of such words. Although expletives and vulgarities certainly existed in medieval times, overall religious morality and social mores were much stricter and people were more vigilant about controlling their speech and avoiding explicit references to sexual and scatological topics. Today such topics are very common in casual conversation and "taboo" words are frequently used in many social situations.  Overall, it appears that the use of explicit profanities is much more common in the modern era than in medieval times.

Finally, I would also like to mention that although "cussing" certainly existed in medieval times, the overall tone and informal nature of many English words and phrases used today were much less acceptable in medieval times. Using colloquial language to address or refer to a noble or authority figure would be considered highly inappropriate and even insulting. In general, the overall informality and freedom of speech that is commonplace in modern culture did not exist to the same extent in medieval times.
assistant
Was 'foul' language used in medieval times? I'm interested in how people of this time expressed "cuss words"