se·cre·tive 
/ˈsi:krətɪv/ adjective
/ˈsi:krətɪv/ adjective [more secretive; most secretive] : not letting people see or know what you are doing or thinking : tending to act in secret
▪ a highly secretive organization ▪ He's very secretive about his work.
▪ a highly secretive organization ▪ He's very secretive about his work.
— se·cre·tive·ness noun [noncount]
