surreptitious vs hole-and-corner

surreptitious and hole-and-corner both are adjectives.

Word	Noun	Adjective	Verb	Adverb
surreptitious	No	Yes	No	No
hole-and-corner	No	Yes	No	No

As adjectives, surreptitious and hole-and-corner are synonyms defined as:

surreptitious and hole-and-corner: conducted with or marked by hidden aims or methods

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

surreptitious (adjective)	hole-and-corner (adjective)
marked by quiet and caution and secrecy; taking pains to avoid being observed	conducted with or marked by hidden aims or methods
conducted with or marked by hidden aims or methods	relating to the peripheral and unimportant aspects of life