sub-rosa Synonyms

under the rose out of public view hush-hush huggermugger surreptitiously discreetly conspiratorially clandestinely between ourselves behind the curtain behind closed doors in a corner in camera in confidence by stealth under cover undercover sneakily on the side on the quiet on the qt on the q.t. off the record in private in secret under-the-table private personally intimately furtively furtive covertly covert confidentially confidential clandestine privately privily behind-the-scenes backstage veiled underhandedly surreptitious stealthily slyly secretly secret quietly backstairs