Hard to outwit
Else clues• Artful
• Artfully clever
• Astute
• Clever
• Crafty
• Crazy like a fox
• Cunning
• Designing
• Full of guile
• Full of tricks
• Guileful
• Like a coyote
• Like a fox
• Like a slyboots
• Pretty tricky
• Scheming
• Shrewd
• Skilled at deception
• Skillfully deceptive
• Slick
• Sly
• Sly as a fox
• Tricky