furtively

From Middle English furtyvely; equivalent to furtive +‎ -ly.

• (UK) IPA^(key): /ˈfɜːtɪvli/

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furtively (comparative more furtively, superlative most furtively)

1. In a furtive manner.
   • 1906, Lord Dunsany [i.e., Edward Plunkett, 18th Baron of Dunsany], Time and the Gods‎^[1], London: William Heineman, →OCLC, page 4:

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

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

     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!

• secretively
• surreptitiously