Etymology
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acerbic (adj.)

1865, originally, and usually, figurative: "sour, harsh, severe" (of speech, manners, etc.), from Latin acerbus "harsh to the taste, sharp, bitter, sour," especially of unripe fruits, etc., also figuratively, of character, conduct, etc. (see acerbity) + -ic. The earlier adjective was simply acerb (1650s), from French acerbe, from Latin acerbus.

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Definitions of acerbic

acerbic (adj.)
sour or bitter in taste;
Synonyms: acerb / astringent
acerbic (adj.)
harsh or corrosive in tone;
an acerbic tone piercing otherwise flowery prose
Synonyms: acerb / acid / acrid / bitter / blistering / caustic / sulfurous / sulphurous / virulent / vitriolic
From wordnet.princeton.edu