Depends on how you use them, words in of themselves arenât sinful.
Theyâre use can be, if you use the it to curse someone, blaspheme, or profane(cursing, blasphemy and profanity ACTUALLY mean something in Catholicism, and arenât just synonyms for âbadâ words) something, then it is a sin. If the words cause scandal, for example using them around your parents, small children, etc. then thatâs a sin as well. But if you stub your toe or run into the walll or something and a word slips out witout any of the above intent, then probabaly not, though you may confess it if itâs still on your conscience. Over all itâs probabky best to avoid words that are defined as âbadâ words in our current culture, because they probably will cause scandal to someone, unless you are familiar with the people youâre around.