swear word

noun

1. A word considered obscene and vulgar or offensive.

   “Near-synonyms: epithet, four-letter word; (uncountable) bad language, strong language, French”

   “When I heard swear words from the next room, I decided to keep my distance.”

2. A word that escapes someone's mind (and therefore often also their mouth) in a nearly automatic way when the person is under duress, mental stress or distress, etc; such words are often obscene and vulgar or offensive.

   “Near-synonyms: dirty word, curse word, naughty word, curse, epithet, four-letter word; (uncountable) bad language, strong language, French”