furtive vs sneaky

furtive and sneaky both are adjectives.

Word	Noun	Adjective	Verb	Adverb
furtive	No	Yes	No	No
sneaky	No	Yes	No	No

As adjectives, furtive and sneaky are synonyms defined as:

furtive and sneaky: marked by quiet and caution and secrecy; taking pains to avoid being observed

Other synonyms of furtive include sneak, stealthy, surreptitious.

furtive (adjective)	sneaky (adjective)
marked by quiet and caution and secrecy; taking pains to avoid being observed	marked by quiet and caution and secrecy; taking pains to avoid being observed
secret and sly or sordid	marked by deception