furtively, on the sly(adverb)
in a furtive manner
"the soldiers were furtively crawling through the night"
on the sly(Adverb)
Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
The numerical value of on the sly in Chaldean Numerology is: 6
The numerical value of on the sly in Pythagorean Numerology is: 1
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