Englishfaux pas
noun
I committed a faux pas which they never let me forget:
gaffe, blunder, mistake;
indiscretion, impropriety, breach/lapse of etiquette, solecism, gaucherie, peccadillo;
informal boo-boo, slip-up, howler, boner;
British, informal boob, clanger;
North American, informal blooper;
British, informal , dated bloomer.
faux pas Oxford Dictionary of English