From Longman Dictionary of Contemporary Englishsecretivese‧cre‧tive /ˈsiːkrətɪv, sɪˈkriːtɪv/ adjectiveSECRETa secretive person or organization likes to keep their thoughts, intentions, or actions hidden from othersOPP open
The government has been accused of being secretive and undemocratic.secretive about
Carla was always very secretive about her work. —secretively adverb —secretiveness noun [uncountable]Examples from the Corpussecretive• Kath's very secretive about her past, isn't she?• Years of living alone had made her secretive and unwilling to trust anyone.• A very secretiveboy, I think I mentioned that.• Falconer was quiet and secretive but seemed in very good humour, laughing and talking rather garrulously.• Why did Stephen always have to be so secretive in his business dealings?• His style as leader, distrustful and secretive, promptsregularcomparisons to Richard Nixon.• They sat there smiling a secretive smile.• At least one dancer was surprised to learn that Alvin had a brother, so secretive was he about his life.