The root of “acerbic” is the Latin adjective “acerbus,” meaning “harsh or unpleasant.” The meaning has held true in English, with the adjective “acerbic” being applied to anything with a sharp, sarcastic, or cutting delivery. The original meaning of “acerbic” concerned a literal bitter taste, but it has evolved to also describe a more figurative harsh tone or expression. But with all things concerning taste, it’s subjective. From food to personalities, what’s sour and unpleasant to one person might be perfectly sharp for another.