Acerbic means sharply critical or sarcastic in a way that stings. When someone makes an acerbic comment, their words have a biting, harsh edge that can make the listener wince. It's like the difference between saying “That wasn't your best work” and saying “Well, that was spectacularly terrible.”

The word originally described tastes that are harsh and sour, like biting into an unripe lemon. That physical sensation of sourness translates perfectly to describe a sharp, cutting style of speech or writing. An acerbic wit can be entertaining when directed at ideas or situations, but when aimed at people, it can cross the line from clever to cruel.

You might encounter acerbic movie reviews that tear apart a film with cutting humor, or meet someone with an acerbic personality who always seems ready with a stinging comeback. Some comedians build their careers on acerbic observations about society.