adjective (well concealed when postpositive) hidden or concealed in a skilful, satisfactory, or careful manner.

What does it mean to be concealed?

: kept out of sight or hidden from view carrying a concealed weapon … displayed a critical tone toward the justices of their era that combined theoretical dismay with barely concealed contempt.—

Has been concealed meaning?

kept hidden or where it cannot easily be seen: The robbery had been recorded on a concealed security camera. He was carrying a concealed weapon. The room had concealed lighting. See.