SNEAKY
furtive, sneak, sneaky, stealthy, surreptitious
(adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed; āa furtive mannerā; āa sneak attackā; āstealthy footstepsā; āa surreptitious glance at his watchā
sneaky, underhand, underhanded
(adjective) marked by deception; āachieved success in business only by underhand methodsā
Source: WordNet® 3.1
Etymology
Adjective
sneaky (comparative sneakier, superlative sneakiest)
Difficult to catch due to constantly outwitting the adversaries
Dishonest; deceitful.
Synonyms
• slippery
• evasive, dodgy
Noun
sneaky (plural sneakies)
(espionage, slang) Any device used for covert surveillance.
Anagrams
• Kaysen, Sankey, Yankes, snakey
Source: Wiktionary
Sneak"y, n.
Definition: Like a sneak; sneaking.
Source: Webster’s Unabridged Dictionary 1913 Edition