According to the built-in dictionary on Apple computers: Profanity | prəˈfanədē | noun (plural profanities) is
blasphemous or obscene language: an outburst of profanity.
a swear word; an oath.
irreligious or irreverent behavior.
The word originated in the mid-16th century, but curses have likely been part of human speech since the beginning of human speech. Whomever first stubbed their toe on a rock likely muttered or screamed out something while in pain.
But who decided which words were profane and which weren’t? I don’t know. I know there are words that can’t be said on television or the radio.