It seemed obvious to me that this man didn't understand French, because I made several remarks in a loud voice that were bound to provoke him to some involuntary show of interest had he understood them; but he remained mute and emotionless.
Il me parut évident que cet homme ne comprenait pas le français, car plusieurs fois je fis à voix haute des réflexions qui auraient dû lui arracher quelque signe involontaire d'attention, s'il les eût comprises, mais il resta impassible et muet.