In a furtive manner

Usage examples of sneakily.

The result, last time, had been an epochal, roaring row, in which the former king had openly accused his youngest of cowardice and lack of manhood, after having sneakily filled him brimfull of Hatburna mead.

The soil seemed sneakily transparent, thinly buried stars trying to burn through it like diamond drill bits.

He crossed his great toe over his second toe (as if sneakily warding off the consequences of telling a lie) and the eldritch bones in the scope made an X that was not white but goblin-green.

But not one of the first twenty-two was what you’d call a superjock, and very sneakily I weasel back to my first guess.