Definitions:

1. a state of confusion noun
   • They engaged in the huggermugger of international finance.
2. in secrecy adverb
   • they did it all huggermugger

Synonyms:

• clandestine
• cloak-and-dagger
• hole-and-corner
• hush-hush
• in secret
• secret
• surreptitious
• topsy-turvy
• undercover
• underground