clandestine

Từ điển American Heritage Dictionary 4th

clan·des·tine (klăn-dĕsʹtĭn)adj.
Kept or done in secret, often in order to conceal an illicit or improper purpose. See Synonyms at secret. [Latin clandestīnus, probably blend of *clam-de, secretly (from clam. See kel-¹ in Indo-European Roots), and intestīnus, internal; see intestine.] clan·desʹtine·ly adv.clan·desʹtine·ness or clan'des·tinʹi·ty n.

• Từ đồng nghĩa / Synonyms:
  cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground