Related Clues:

• Like a tack
• Knifelike
• On the button
• Cheese adjective
• Piercing
• Tangy
• Nobody's fool
• Like some cheddar
• Quick on the uptake
• Type of tone
• Tacky?
• Off-key, in a way
• Opposite of mild, in cheeses
• Like some wits or cheeses
• Incisive