Adverb
Stealthily by theft.
Source: Webster's dictionaryCorrelation doesn't imply causation, but it does waggle its eyebrows suggestively and gesture furtively while mouthing ‘look over there.' Randall Munroe
Nothing is more repulsive than a furtively prurient spirituality it is just as unsavory as gross sensuality. Carl Jung
the soldiers were furtively crawling through the night Source: Internet
A small brown rodent, scurrying furtively this way and that. Source: Internet
I was wearing her in her carrier, and he kept glancing around furtively, saying stuff like, “Man, if any of my buds from work see me, they’re going to be so confused, haha.” Source: Internet
He glanced around the room furtively, looking for an escape. Source: Internet