in ambush

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

classified confidential covert furtive hush-hush restricted secretive surreptitious

backdoor backstairs close inside sneak

camouflaged cryptic discreet disguised dissembled dissimulated 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