characterized by, done in, or executed with secrecy or concealment, especially for purposes of subversion or deception; private or surreptitious: Their clandestine meetings went undiscovered for two years.

1560–70; < Latin clandestīnus, equivalent to *clande, *clamde, variant of clam secretly (with -de adv. particle) + -stīnus, probably after intestīnus internal; see intestine

clandestinely, adverb
clandestineness, clandestinity, noun
unclandestinely, adverb

hidden, underhand, confidential, illicit. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clandestine (klænˈdɛstɪn)
secret and concealed, often for illicit reasons; furtive
[C16: from Latin clandestīnus, from clam secretly; related to Latin celāre to hide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1566, from L. clandestinus "secret, hidden," from clam "secretly," from base of celare "to hide" (see cell).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Both are backstairs literatures that often have to be semi-clandestinely distributed, then read with the shades drawn.
They cross-reference it with the local newspaper or a clandestinely intercepted
  phone conversation.
When nothing comes of either affair, she gives herself clandestinely to a
  chance-met train acquaintance.
Criminals are now using bulk pseudoephedrine and pseudoephedrine drug products
  to clandestinely manufacture methamphetamine.
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