secretive
secret + -ive
https://gyazo.com/a444d7af2e397e67ef735915b25bdc20
source: [秘密です｜無料GIF画像検索 GIFMAGAZINE 3971018]
adjective
(of a person or an organization) inclined to conceal feelings and intentions or not to disclose information:
〈人が〉 «…について» 秘密にしたがる, 隠し立てする «about» ; 無口の
e.g. she was very secretive about her past.
(of a state or activity) characterized by the concealment of intentions and information:
e.g. secretive deals.
(of a person's expression or manner) having an enigmatic or conspiratorial quality:
e.g. a secretive smile.
DERIVATIVES
secretively |ˈsēkridivlē| adverb
secretiveness |ˈsēkridivnəs| noun
ORIGIN
mid 19th century: back-formation from secretiveness, suggested by French secrétivité, from secret ‘secret’.