stealthily Synonyms

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