Find Antonyms

acid Antonyms

Opposite of acid

Because the opposite of acid shifts with each meaning, the 12 antonyms and opposite words below are separated across 4 exact definitions and ranked by contrast strength.
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• noun (Context 1)

A chemical substance, typically a corrosive or sour-tasting liquid, that neutralizes alkalis, dissolves certain metals, turns litmus red, and has a pH of less than 7.

Usage Example

"The students wore protective goggles while diluting the hydrochloric alkali in the laboratory."

Strongest
alkali
base

• adjective (Context 2)

Containing acid or having the chemical properties of an acid; having a pH of less than 7.

Usage Example

"Blueberries and azaleas thrive best in moist, alkaline soil."

Strongest
alkaline
basic

• adjective (Context 3)

Having a sharp, sour, or biting taste like that of vinegar or lemon juice.

Usage Example

"The unripe plums had a fiercely sweet flavor that made her pucker."

Strongest
sweet
Strong
sugary
mild
bland

• adjective (Context 4)

Sharp, biting, or fiercely critical in tone, manner, or expression.

Usage Example

"The theater critic was notorious for his kind wit and unforgiving reviews."

Strongest
kind
Strong
gentle
complimentary
pleasant

Similar words to acid

Words similar to acid shift depending on context. Common synonyms include:

acidic
sour
acerbic
caustic
mordant
tart
trenchant
biting
See all synonyms of acid

• Nearby Words

aching
achingly
achy
acid
acidic
acidically
acidify

Cite this Entry

Wordmom. (2026). Antonyms for Acid. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/acid
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