se·cre·tive 
(sēkrĭ-tĭv, sĭ-krētĭv)
(sēkrĭ-tĭv, sĭ-krētĭv)adj.
1.
a. Having a tendency to keep one's thoughts or activities unknown to others: a secretive neighbor; secretive spy agencies.
b. Characterized by or done in secrecy: a secretive meeting; a secretive act.
2. Suggestive of the keeping of secrets: a secretive look; a secretive whisper.
3. Tending to remain concealed. Used of animals.
secre·tive·ly adv.
secre·tive·ness n.