In a sour, bitter, or harshly critical manner; speaking or acting with sharp, cutting words or tone.
From 'acerbic' (adjective) + '-ally' (adverb suffix). 'Acerbic' comes from Latin 'acerbus' and gained the '-ic' ending to become an adjective describing the quality itself.
Notice how 'acerbic' humor is actually valued in comedy—we enjoy people who make witty, cutting jokes, so this 'harsh' quality can be entertaining!
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