on the q.t

1 秘密

secret hidden closed underground intimate confidential shady undercover covert shadowy backdoor stealthy backroom backstreet underhand closed-door furtive hush-hush backstairs hole-and-corner secretly confidence secrecy on the quiet behind closeddoors behind the scenes in secret in confidence on the sly under the counter by the back door in camera hugger-mugger sub-rosa close inside private dark pocket quiet chamber closet bye classified snug backstage behind-the-scenes arcane esoteric unpublished privy cryptic subterranean clandestine hermetic sneaking surreptitious hid unrevealed unbreathed undivulged privately darkly privily under-the-counter reserve privacy mystery reservation stealth mysticism arcanum by- dern on the cuff under the rose for the cuff under hat just quietly under cover behind closed doors among ourselves

2 秘密地

underground secretly on the quiet behind closeddoors behind the scenes in secret in confidence on the sly under the counter by the back door in camera privately backstage underhand privily on the cuff under the rose under hat just quietly under cover behind closed doors among ourselves

3 悄悄地

quietly confidentially on the quiet quiet silently by stealth

4 悄悄

unknown mousy quiet quietly silently by stealth