klanˈdestə̇n, klaan- adjective
Etymology: Middle French or Latin; Middle French clandestin, from Latin clandestinus, from (assumed) Latin clamde secretly (from Latin clam secretly) + Latin -stinus (as in intestinus internal); akin to Latin celare to hide — more at hell , intestine
: marked by, held in, or conducted with secrecy and concealment : not openly avowed or generally known : given to wary concealment
a clandestine love affair
to elude the vigilance of church and state … a number of Tolstoy's pamphlets were printed by a clandestine press — New Republic
Synonyms: see secret