secretive

adj.
Having or marked by an inclination to secrecy; not open, forthright, or frank. See synonyms at silent.

secretively se'cre·tive·ly adv.
secretiveness se'cre·tive·ness n.

adjective

Trickily secret: furtive, sly, sneaking, sneaky, surreptitious. See honest/dishonest.

adj

Definition: uncommunicative
Antonyms: communicative, forthright, honest, open

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The adjective has one meaning:

Meaning #1: inclined to secrecy or reticence about divulging information
  Synonyms: close, closelipped, closemouthed, tightlipped

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