Is it sinful to curse or swear when startled or angry?

Hello, i want to ask, is it a sin if i swear/curse when i'm angry or startled? Thank you in advance

Hello,

The Quran says:

God does not like the public uttering of bad language, unless someone was wronged. God is Hearing and Knowing. (The Quran, verse 4:148)

So speaking curses aloud is not recommended, so if you have to curse, it’s best to do it only in your head.