in chambers

covert enigmatic reticent taciturn

backstairs buttoned-up cagey clammed up close close-mouthed cryptic feline furtive hushed in privacy in private in the background in the dark on the Q.T. reserved silent tight-lipped undercover unforthcoming withdrawn zipped

communicative

forthright honest open

a huis clos in camera in closed meeting in executive session in secret meeting januis clausis