Etymology
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clandestine (adj.)

"secret, private, hidden, furtive," 1560s, from Latin clandestinus "secret, hidden," from clam "secretly," from adverbial derivative of base of celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"), perhaps on model of intestinus "internal." Related: Clandestinely. As a noun form, there is awkward clandestinity (clandestineness apparently being a dictionary word).

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Definitions of clandestine

clandestine (adj.)
conducted with or marked by hidden aims or methods;
clandestine intelligence operations
Synonyms: cloak-and-dagger / hole-and-corner / hugger-mugger / hush-hush / secret / surreptitious / undercover / underground
From wordnet.princeton.edu