fūrtīvē adv.
furtivus, stealthily, secretly, furtively : data munera, O.
furtīvē, adv., v. furtivus fin. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
·adj Stolen; obtained or characterized by stealth; sly; secret; stealthy; as, a furtive look. ...
Webster's Dictionary of the English Language