sneaky (adj.)

• acute
• arch
• artful
• astute
• backstairs
• cagey
• calculating
• canny
• clandestine
• clever
• collusive
• covert
• crafty
• cringing
• cunning
• cute
• deceitful
• deep
• deep-laid
• designing
• devious
• diplomatic
• dishonest
• disingenuous
• duplicitous
• false
• feline
• foxy
• fraudulent
• furtive
• guileful
• hole-and-corner
• hugger-mugger
• indirect
• ingenious
• insidious
• inventive
• knowing
• pawky
• politic
• privy
• quiet
• ready
• resourceful
• scheming
• serpentine
• sharp
• shifty
• shrewd
• slick
• slippery
• sly
• smooth
• snaky
• sneaking
• sophistical
• stealthy
• strategic
• subtle
• supple
• surreptitious
• tactical
• treacherous
• tricksy
• tricky
• two-faced
• under-the-counter
• under-the-table
• undercover
• underground
• underhand
• underhanded
• unobtrusive
• unscrupulous
• vulpine
• wary
• wily