imperceptibly
From LSJ
τίς τὸν πλανήτην Οἰδίπουν καθ' ἡμέραν τὴν νῦν σπανιστοῖς δέξεται δωρήμασιν → who on this day shall receive Oedipus the wanderer with scanty gifts
English > Greek (Woodhouse)
adverb
P. and V. λάθρα, λαθραίως (rare B.).
little by little: P. κατ' ὀλίγον, κατὰ βραχύ; see gradually.
do a thing imperceptibly: P. and V. λανθάνειν ποιῶν τι, V. λήθειν ποιῶν τι.