hugger-mugger

nouns

a state of confusion
"he engaged in the hugger-mugger of international finance"
is derived from
is a type of (narrower)
disorder resulting from a failure to behave predictably
"the army retreated in confusion"

adjectives

in utter disorder
"a disorderly pile of clothes"
conducted with or marked by hidden aims or methods
"clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"

adverbs

in secrecy
"they did it all hugger-mugger"