cloak-and-dagger vs clandestine

cloak-and-dagger and clandestine both are adjectives.

Word	Noun	Adjective	Verb	Adverb
cloak-and-dagger	No	Yes	No	No
clandestine	No	Yes	No	No

As adjectives, cloak-and-dagger and clandestine are synonyms defined as:

cloak-and-dagger and clandestine: conducted with or marked by hidden aims or methods

Other synonyms of cloak-and-dagger include hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground.

cloak-and-dagger (adjective)	clandestine (adjective)
conducted with or marked by hidden aims or methods	conducted with or marked by hidden aims or methods