clandestine vs cloak-and-dagger

clandestine and cloak-and-dagger both are adjectives.

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

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

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

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

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