clandestine

[klan-des-tin]
adjective
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.

Origin:
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.
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World English Dictionary
clandestine (klænˈdɛstɪn)
 
adj
secret and concealed, often for illicit reasons; furtive
 
[C16: from Latin clandestīnus, from clam secretly; related to Latin celāre to hide]
 
clan'destinely
 
adv
 
clan'destineness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

clandestine
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
Bribery, betting and betrayal are the order of the day, and secret negotiations
  and clandestine plots abound.
While the relationship was private, it can hardly be called furtive or
  clandestine.
Biological weapons are not only more potent than chemical weapons but they are
  easier to produce in small, clandestine facilities.
And a handful of the youngest ones are scouts for the clandestine betting
  houses in the city center.
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