personal, private / secret

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law

private; mine

(formal) first-person singular pronoun: I, me

one shouldn't bury one's head in the sand while leaving one's bottom exposed

conceal, cover up

(weaponry) hidden/concealed weapons

secret camera; hidden camera

everything

(colloquial) current boyfriend