huggermugger

noun

The habit, practice, or policy of keeping secrets: clandestineness, clandestinity, concealment, covertness, huggermuggery, secrecy, secretiveness, secretness. See show/hide.

adjective

Existing or operating in a way so as to ensure complete concealment and confidentiality: clandestine, cloak-and-dagger, covert, secret, sub rosa, undercover. Informal hush-hush. Idioms: under wraps. See show/hide.

adverb

In a secret way: clandestinely, covertly, secretly, sub rosa. Idioms: by stealth, on the sly, under cover. See show/hide.