sour or astringent in taste: Lemon juice is acerbic.
harsh or severe, as of temper or expression: acerbic criticism.

1860–65; < Latin acerb(us) sour, unripe, bitterly harsh + -ic, irregular for -ous

acerbically, adverb
unacerbic, adjective
unacerbically, adverb

acerbic, acid, acrid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acerbic (əˈsɜːbɪk)
harsh, bitter, or astringent; sour
[C17: from Latin acerbus sour, bitter]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1865, originally, and usually, figurative, "sour, harsh, severe" (of speech, manners, etc.), from L. acerbus "harsh to the taste, sharp, bitter, sour" (see acerbity).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Again, for all the acerbic social messages, there exists a psychological
  economy that is particularly American.
Correcting someone's grammar, or making acerbic jokes, can have consequences.
For sharp characterization and wry, generally acerbic comments on
  relationships, Shapiro outclasses most of her peers.
It is deftly written with occasional flashes of acerbic wit.
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