casting down his countenance, and making as if he heard not: where he is not known, he will do thee a mischief before thou be aware.
WEB
Sirach 19:27
bowing down his face, and pretending to be deaf in one ear. Where he isn’t known, he will take advantage of you.
Parallel Translations
Casting down his countenance, and making as if he heard not: where he is not known, he will do you a mischief before you be aware.
Casting down his countenance, and making as if he heard not: where he is not known, he will do thee a mischief before thou be aware.