#13 "serrurerie" This one is the hardest word that expats listed as most difficult in an article from TheLocal.fr, “10 hardest words in French”. In our series “Hard Words” we have covered them all (lesson 2-13). And “serrurerie” really is a challenge to pronounce. All those r's! In this lesson you will learn the secret to overcoming the difficulties of this pesky word as we break it down and make it a bit more pronounceable!