不在

not to be present / to be out / (euphemism) to pass away / to be deceased

no; not so / (bound form) not; un-

to exist; to be alive / (of sb or sth) to be (located) at / (used before a verb to indicate an action in progress)

not to care

absent-minded / preoccupied / inattentive / with one's thoughts wandering

to be nothing difficult / to be a cinch

to pay no attention to / not to mind

to be out of form / not to be oneself

don't meddle in affairs that are not part of your position (Confucius)

to have one's ambitions elsewhere (idiom)

really does not care

a book is not judged by its cover (idiom)

to be dead / to have passed away