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There’s no solid evidence that Gautama Buddha used “swear words” in the way we think of them today.
In the earliest Buddhist texts (like the Pāli Canon), he’s portrayed as very deliberate and disciplined in speech. One of the core teachings is right speech (in Buddhism), which means avoiding:
harsh or abusive language
lying
gossip or divisive talk
pointless chatter
That said, he didn’t always speak gently in tone. There are moments where he uses sharp or blunt language to correct someone—calling behavior “foolish,” “ignorant,” or “unskillful.” In context, this wasn’t casual anger or venting; it was meant as instruction, not insult.
Also worth noting: what counts as a “swear word” is very culturally specific. Ancient India didn’t have the same categories of profanity we have today. So even when the Buddha used strong words, they weren’t the equivalent of modern curse words.
So:
No evidence of casual swearing or profanity
Occasional firm, even cutting speech, but with a teaching purpose
Strong emphasis on ethical, mindful communication