guileful (adj.)
- acute
- arch
- artful
- astute
- cagey
- calculating
- canny
- clever
- collusive
- crafty
- cunning
- cute
- deceitful
- deep
- deep-laid
- designing
- devious
- diplomatic
- duplicitous
- false
- feline
- foxy
- fraudulent
- furtive
- indirect
- ingenious
- insidious
- inventive
- knowing
- pawky
- politic
- ready
- resourceful
- scheming
- serpentine
- sharp
- shifty
- shrewd
- slick
- slippery
- sly
- smooth
- snaky
- sneaking
- sneaky
- sophistical
- stealthy
- strategic
- subtle
- supple
- surreptitious
- tactical
- treacherous
- tricksy
- tricky
- two-faced
- underhand
- underhanded
- vulpine
- wary
- wily
