Another word for insult

; Main Entry: : gaffe ; Pronunciation: : \ˈgaf\ ; Function: : noun ; Etymology: : French, gaff, gaffe ; Date: : 1909 1 : a social or diplomatic blunder

2 : a noticeable mistake

This is probably the closest you can come to what you are seeking in English. It tends to apply more to actions than to Words, but I think it would still apply to an unintented spoken insult.