furtively

comparative more furtively · superlative most furtively

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.

   1906, Lord Dunsany [i.e., Edward Plunkett, 18th Baron of Dunsany], Time and the Gods, London: William Heineman, →OCLC, page 4

   1 more example

   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!

   1983, Bill Oddie, Gone Birding, London: Methuen, page 128

   Synonyms: secretively, surreptitiously