caustic
KAW-stik
/ˈmɒkɪŋ/
Sarcastic, cutting, and biting in a scathing and bitter way.
Caustic can describe both physical chemical substances that burn skin and verbal remarks that burn the spirit. Verbal causticity is highly destructive, sharp, and designed to sting.
The story behind the word. The word caustic traces back to the Greek 'kaustikos', from 'kaiein', meaning 'to burn'. It entered English in the 14th century to describe chemical substances like acid or lye that corrode tissue. By the 17th century, writers began using it metaphorically to describe speech that was so sharp and bitter it felt like it could physically burn.
Word relationships
- scathing: Scathing implies a devastatingly harsh attack, while caustic emphasizes the bitter, acidic, and corrosive nature of the wit.
- mordant: Mordant implies a sharp, biting quality that is often clever, whereas caustic is more directly painful and destructive.
- soothing: Soothing implies a calming, gentle effect that relieves pain or tension.
- conciliatory: Conciliatory describes speech or actions intended to placate, pacify, or win over an opponent.
Commonly confused with
- sardonic: Sardonic is grimly mocking and self-aware, while caustic is directly aggressive, sharp, and designed to burn or wound the recipient.
Word family
- caustically (adverb): In a scathing, bitter, or sarcastic manner.
- causticity (noun): The quality of being caustic; bitterness or corrosiveness.
Collocations
- caustic wit
- caustic remark
- caustic review
- caustic tongue
Example sentences
- "The reviewer's caustic comments left the young author questioning her career path." A description of a harsh literary critic's style.
Memory hook
Think of 'caustic soda' (sodium hydroxide), which burns skin. A caustic remark burns your feelings just like acid. Acidic words that burn like caustic soda.
When not to use
Do not use caustic to describe mild sarcasm; it should be reserved for remarks that are genuinely harsh, bitter, and damaging.
Fun facts
- In chemistry, 'caustic' refers specifically to strong bases (like caustic soda) rather than acids, though both can burn.
- The word 'holocaust' shares the same Greek root 'kaustikos' (meaning 'burnt whole').
Also appears in
Take your vocabulary further with LangBlitz
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.