stealthily Synonyms

as still as a mouse on the q.t. insidiously in confidence in camera hush-hush surreptitiously secretively discreetly conspiratorially collusively clandestinely behind someone's back on the qt on the quiet on the side in a quiet way by stealth voyeuristically unobserved under the counter under cover thievishly undercover sneakingly sneakily shiftily on the sly behind closed doors in secret petit larceny latently intimately incognito hiddenly furtively furtive esoterically enigmatically deducibly deceitfully craftily covertly obscurely privately privily sub-rosa foxily unknow underhandedly