Etymology
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furtively (adv.)

late 15c.; from furtive + -ly (2).

updated on October 24, 2012

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Definitions of furtively from WordNet

furtively (adv.)
in a furtive manner;
the soldiers were furtively crawling through the night
Synonyms: on the sly
From wordnet.princeton.edu, not affiliated with etymonline.