In general contexts, caustic describes bluntly and harshly critical remarks, statements, or ways of being and communicating, as in "a caustic remark" or "caustic humor." In contexts involving chemistry, caustic is a synonym of
"For [novelist Milan] Kundera, the deadly foe of truthful art was kitsch: the narcissistic sentimentality that, under any social system, effaces realities and encourages people to 'gaze into the mirror of the beautifying lie.' With caustic irony, mordant wit and acrobatic literary skill, he mocked the beautifying lie wherever he found it—in politics, in culture or in personal relationships." — The Economist, 13 July 2023
If you have a burning desire to know the origins of caustic, you're already well on your way to figuring it out. Caustic was formed in Middle English as an adjective describing chemical substances, such as lime and lye, that are capable of destroying or eating away at something. The word is based on the Latin adjective causticus, which itself comes ultimately from the Greek verb kaiein, meaning "to burn." In time, caustic was baked into the English language as an adjective describing people or things (such as wit or remarks) that are bitingly sarcastic. Other kaiein descendants in English include cautery and cauterize, causalgia (a burning pain caused by nerve damage), and encaustic (a kind of paint that is heated after it's applied).
Not enough people realize that it is our ability to use our language that will determine our place on the social pyramid–and that will also control, to a great extent, the amount of money we will earn during our lives. Research has shown over and over that a person’s vocabulary level is the best single predictor of occupational success (more info). Ready to reach the top? Subscribe and receive a new word daily via TXT!