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Definitions

acid

[as-id] / ˈæs ɪd /
ADJECTIVE
bitter, sour in taste
Synonyms
STRONGEST
acerbic biting piquant pungent
STRONG
sharp tart
WEAK
acidulous vinegarish vinegary
Antonyms
STRONGEST
bland dull mild
WEAK
basic kind nice sweet
ADJECTIVE
having acidic, corrosive properties
Synonyms
STRONGEST
acerbic acrid biting
STRONG
corroding dissolvent eroding rusting
WEAK
acidulous anti-alkaline bleaching disintegrative eating away erosive oxidizing
Antonyms
STRONGEST
kind nice sweet
WEAK
basic bland
ADJECTIVE
bitter in words or behavior
Synonyms
STRONGEST
acerbic biting caustic mordant nasty sarcastic stinging trenchant vitriolic
STRONG
cutting dry offensive sharp
WEAK
harsh hateful hurtful
Antonyms
STRONGEST
calm kind mild nice pleasant
WEAK
basic bland sweet
NOUN
lysergic acid diethylamide, lsd
Synonyms
STRONG
blotter candy cubes dot hallucinogen microdots mushrooms peyote
WEAK
California sunshine Lucy in the sky with diamonds Owsley's acid black tabs blue Owsley blue acid blue dot electric Kool-Aid green dragon instant Zen magic mushrooms mescalin orange sunshine purple haze strawberry fields sugar cubes yellow sunshine

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Products passing through the giant site range from insulin capsules and lifestyle drugs to medicated sunblock and drums of sulphuric acid.

From Barron's • Apr. 5, 2026

That’s despite few clinical studies supporting the effectiveness or safety of these peptides, which are amino acid chains meant to help regulate functions in the body and have become popular among fitness and longevity enthusiasts.

From Salon • Apr. 4, 2026

In addition to statins, the guideline includes updated recommendations on other cholesterol-lowering therapies, including ezetimibe, bempedoic acid, and injectable PCSK9 monoclonal antibodies.

From Science Daily • Mar. 29, 2026

Ord Minnett says Lotus’s supplies of acid and sulphur look secure at present, but fuel is more precarious.

From The Wall Street Journal • Mar. 25, 2026

“I sure do,” I said with as much acid as possible.

From "Here to Stay" by Sara Farizan