as adverb silently, secretly—(J E) exploring secretly.
Strong's H2791חֶרֶשׁ: magical craft; also silence KJV:cunning, secretly.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 761: חָרֵשׁḥārēš — be silent, dumb, speechless, be deaf; exhibit silence, make silent, shew deafness; scratch, engrave, plough, fabricate, devise, let alone; cease, conceal, ear, graven, imagine, leave off speaking, hold peace, plow, plower…