Synset:clandestine hole-and-corner hugger-mugger hush-hush secret surreptitious undercover underground
Examples:
- 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
Antonyms:overt
Derivationally Related Form:underground
Inherited Hypernyms:clandestine
Similar to:covert