Related Clues:

• Severe, as criticism
• Like grapefruit
• Like lemonade sans sugar
• Like sourballs
• Like crab apples
• Bitter to the taste
• Like lemonade
• Causing the lips to pucker
• Biting, as wit
• Like unripe apples
• Sharp to the taste
• Jam-filled pastry
• Bitter, in poetry
• Sharp in manner, biting
• The pastry sounds bitter