furtively

adv

1. In a furtive manner.

   “And furtively Time looked him in the face and edged towards him fingering with his dripping fingers the hilt of his nimble sword.”

   “The only diversions I recall were a pair of Avocets flying over, and a young lady who regularly each afternoon furtively crept into the dunes [...] and crouched down for a clandestine wee!”