different between acrid vs acidulous

English

From Latin ?cris, from ?cer (“sharp”); probably assimilated in form to acid. Compare eager.

acrid (comparative acrider or more acrid, superlative acridest or most acrid)

Sharp and harsh, or bitter and not to the taste.
Synonyms: pungent, (archaic) acrimonious
Antonyms: delectable, delicious, tasteful
Causing heat and irritation.
Synonym: corrosive
(figuratively) Caustic; bitter; bitterly irritating.
Synonyms: acerbic, acrimonious

From Latin acidulus (“sourish, acidulous”), diminutive of acidus (“acid, sour”). See acid.

acidulous

Slightly sour; sub-acid; sourish.
- 1796, Edmund Burke, a letter to a noble lord
  the hard, acidulous, metallic tincture of the spring
(figuratively) Sharp; caustic.
- 1931, William Somerset Maugham, His Excellency
  He talked with acidulous tolerance of the exalted personages who had sent Ashenden to X.
Containing carbonic acid.
acidulous mineral waters

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