Related Clues

• Perspicacious
• Sharp as a tack
• Quick
• Smart
• Penetrating
• Not born yesterday
• Shrewd
• Keen
• Not easily misled
• On the ball
• Mentally sharp
• Not dull
• Sharp
• Discerning
• Perceptive
• Keenly perceptive
• Savvy
• Knowing
• Clever
• Quick on the uptake