1. (p. pr. & vb. n.) of Sneak.

2. (a.) Marked by cowardly concealment; deficient in openness and courage; underhand; mean; crouching.

all fours back-door backstairs clandestine covert cowering crawl crawling creep creeping cringing deep-rooted deep-seated devious doggo duplicitous feline furtive guileful gumshoeing gut hidden hidden out hidlings hole-and-corner hugger-mugger in ambush in hiding in the wings indirect inherent innate intuitive lingering lurking nagging niggling nightwalking on tiptoe padding persistent private privy prowling pussyfoot pussyfooted pussyfooting quailing quiet scrabble scramble secret shifty sidling skulking slinking slinky sly snaking sneaky stealing stealthy suppressed surreptitious tippytoe tiptoe tiptoeing undeclared under cover under-the-counter under-the-table undercover underground underhand underhanded undisclosed undivulged unexpressed unobtrusive unrevealed unvoiced waiting concealed worming worrisome worrying