• Basic opposite
• Biting
• Bitter
• Bitter tasting
• Hardly basic
• Having a low pH
• Like a substance with a low pH
• Like citrus juices
• Like fluid in a battery
• Like grapefruit juice
• Like lemon juice
• Like lemons
• Like orange juice
• Like orange juice, say
• Like sour grapes
• Like vinegar
• Like vinegar or grapefruit juice
• Like vinegar, e.g.
• Litmus-reddening
• Not alkaline
• Not basic
• Not good for ulcers
• Sharp
• Sharp to the taste
• Sharp-tasting
• Sharply sarcastic
• Sour
• Sour-tasting
• Sourish
• Tangy
• Tart
• Tart to the taste
• Tart-tasting
• Vinegary