backstairs

backdoor camouflaged clandestine classified cloak-and-dagger close confidential covert cryptic discreet disguised dissembled dissimulated furtive hush-hush in ambush incognito inside restricted secretive sly sneak sneaky

classified confidential covert furtive hush-hush restricted secretive surreptitious

backdoor close inside sneak

camouflaged cryptic discreet disguised dissembled dissimulated in ambush incognito sly sneaky stealthy sub-rosa top-secret unacknowledged under false pretense under-the-table underhanded

aboveboard forthright honest known open public

clear defined explicit legal legitimate revealed unconcealed

covert enigmatic reticent taciturn

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communicative

forthright honest open