clandestine

clandestine
    adj 1: conducted with or marked by hidden aims or methods;
           "clandestine intelligence operations"; "cloak-and-dagger
           activities behind enemy lines"; "hole-and-corner
           intrigue"; "secret missions"; "a secret agent"; "secret
           sales of arms"; "surreptitious mobilization of troops";
           "an undercover investigation"; "underground resistance"
           [syn: {clandestine}, {cloak-and-dagger}, {hole-and-
           corner(a)}, {hugger-mugger}, {hush-hush}, {secret},
           {surreptitious}, {undercover}, {underground}]
    

Clandestine \Clan*des"tine\, a. [L. clandestinus, fr. clam
   secretly; akin to celare, E. conceal: cf. F. clandestin.]
   Conducted with secrecy; withdrawn from public notice, usually
   for an evil purpose; kept secret; hidden; private; underhand;
   as, a clandestine marriage. --Locke.

   Syn: Hidden; secret; private; concealed; underhand; sly;
        stealthy; surreptitious; furtive; fraudulent. --
        {Clan*des"tine*ly}, adv. -- {Clan*des"tine*ness}, n.
        [1913 Webster]
    

CLANDESTINE. That which is done in secret and contrary to law. 
     2.Generally a clandestine act in case of the limitation of actions will 
prevent the act from running. A clandestine marriage is one which has been 
contracted without the form which the law has prescribed for this important 
contract. Alis. Princ. 543 
    

26 Moby Thesaurus words for "clandestine":
      back-door, backstairs, covert, feline, furtive, hidlings,
      hole-and-corner, hugger-mugger, privy, quiet, shifty, skulking,
      slinking, slinky, sly, sneaking, sneaky, stealthy, surreptitious,
      under-the-counter, under-the-table, undercover, underground,
      underhand, underhanded, unobtrusive