vulpine (adj.)

• acute
• arch
• artful
• astute
• cagey
• canine
• canny
• clever
• crafty
• cunning
• cute
• deceitful
• deep
• deep-laid
• designing
• diplomatic
• feline
• foxy
• guileful
• ingenious
• insidious
• inventive
• knowing
• lupine
• pawky
• politic
• ready
• resourceful
• scheming
• serpentine
• sharp
• shifty
• shrewd
• slick
• slippery
• sly
• smooth
• snaky
• sneaky
• sophistical
• stealthy
• strategic
• subtle
• supple
• tactical
• tricksy
• tricky
• wary
• wily
• wolfish