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hidden - not accessible to view; "concealed (or hidden) damage"; "in stormy weather the stars are out of sight" concealed, out of sight invisible, unseeable - impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending" 2. hidden - designed to elude detection; "a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk" secret concealed - hidden on any grounds for any motive; "a concealed weapon"; "a concealed compartment in his briefcase" 3. hidden - difficult to find; "hidden valleys"; "a hidden cave"; "an obscure retreat" obscure concealed - hidden on any grounds for any motive; "a concealed weapon"; "a concealed compartment in his briefcase"