Example : He engaged in the hugger-mugger of international finance.

Example : A disorderly pile of clothes.

Synonyms : disorderly, higgledy-piggledy, jumbled, topsy-turvy

Example : 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.

Synonyms : clandestine, cloak-and-dagger, hole-and-corner, hush-hush, secret, surreptitious, undercover, underground

Example : They did it all hugger-mugger.