Related Clues:

• Shrewdly astute
• Quick and surefooted
• Like a tightrope walker
• Vivid
• Not quite right?
• Very perceptive
• Sharp, as wits
• Like an acrobat
• Less than right?
• Nimble and quick
• With haste
• Fleet of foot
• Gymnastic
• Quick-footed
• "Neato!"