Synonyms: secret, undercover, underground, surreptitious, hole-and-corner, hugger-mugger, hush-hush, clandestine, cloak-and-dagger
Definition: conducted with or marked by hidden aims or methods
Usage: 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
Similar words: covert
Definition: secret or hidden; not openly practiced or engaged in or shown or avowed
Usage: covert actions by the CIA; covert funding for the rebels
Synonyms: hole-and-corner, hole-in-corner
Definition: relating to the peripheral and unimportant aspects of life
Usage: a hole-and-corner life in some obscure community- H.G.Wells
Similar words: insignificant, unimportant
Definition: devoid of importance, meaning, or force