/ ˈsiːkrətɪv; NAmE / adjective
secretive (about sth) tending or liking to hide your thoughts, feelings, ideas, etc. from other people :
He's very secretive about his work.
► se·cret·ive·ly adverb
► se·cret·ive·ness noun [ U ]
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WORD ORIGIN
mid 19th cent.: back-formation from secretiveness , suggested by French secrétivité , from secret secret.