caustic
C1Formal and technical
Definition
Meaning
A substance capable of burning or corroding organic tissue by chemical action.
Language or humour that is sharply sarcastic or bitingly critical.
Linguistics
Semantic Notes
The primary sense is chemical/physical; the secondary sense (of wit, humour, etc.) is metaphorical, deriving from the 'burning' effect.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Both use the same core and extended senses.
Connotations
Identical connotations in both varieties: highly negative for substances, negative but sometimes admiring for wit ('caustic wit').
Frequency
Similar frequency in both regions. Slightly more common in technical/scientific writing.
Vocabulary
Collocations
Grammar
Valency Patterns
[Adj] + Noun (caustic + remark)Be + [Adj] (be caustic)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No major idioms; the word itself is often used figuratively]”
Usage
Context Usage
Business
Rare, except metaphorically: 'The CEO's caustic feedback demoralised the team.'
Academic
Common in chemistry texts: 'Caustic alkalis require careful handling.' Also in literary criticism: 'the playwright's caustic satire'.
Everyday
Mostly used metaphorically for harsh criticism: 'She has a caustic tongue when angry.'
Technical
Primary domain: chemistry and industrial processes. 'Sodium hydroxide is a common caustic agent.'
Examples
By Part of Speech
verb
British English
- N/A – 'caustic' is not used as a verb.
American English
- N/A – 'caustic' is not used as a verb.
adverb
British English
- N/A – 'caustic' is not used as an adverb. The adverb is 'caustically'.
- She replied caustically to his naive question.
American English
- N/A – 'caustic' is not used as an adverb. The adverb is 'caustically'.
- The critic wrote caustically about the director's latest film.
adjective
British English
- The plumber used caustic soda to clear the drain.
- Her caustic review of the play was the talk of the interval.
American English
- Safety gloves are essential when handling caustic chemicals.
- He was known for his caustic sense of humor.
Examples
By CEFR Level
- (A2 level rarely uses this word.)
- Cleaning products can contain caustic substances.
- His comments were funny but a bit caustic.
- The industrial accident involved a spill of highly caustic material.
- Her caustic wit made her a formidable interviewer.
- The philosopher's caustic critique of modern society challenged his readers.
- The caustic alkaline solution etched the glass surface.
Learning
Memory Aids
Mnemonic
Think: 'CAUSTIC' sounds like 'COST ICK' – if you spill a caustic chemical, the cost (damage) will make you feel icky (sick). Also, 'CAUSTIC' wit 'burns' like acid.
Conceptual Metaphor
CRITICISM IS A CORROSIVE/CHEMICALLY BURNING SUBSTANCE (e.g., 'His words were caustic').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не переводите как "каустический" в повседневной речи (это технический термин).
- Для метафорического значения (язвительный, едкий) используйте 'biting', 'sarcastic', 'scathing'.
- Осторожно с 'caustic soda' – это 'каустическая сода' (гидроксид натрия), а не пищевая сода.
Common Mistakes
- Confusing 'caustic' with 'corrosive' (all caustic substances are corrosive, but not all corrosive substances are caustic – caustic specifically refers to strong alkalis).
- Using it to mean simply 'angry' rather than 'bitingly sarcastic'.
- Misspelling as 'caustical' (the adjective is just 'caustic').
Practice
Quiz
In which context is the word 'caustic' used METAPHORICALLY?
FAQ
Frequently Asked Questions
No. While its primary, literal meaning refers to burning/corroding chemicals (like caustic soda), it is very commonly used metaphorically to describe bitingly sarcastic or critical speech or humour.
'Sarcastic' implies mocking irony, often humourous. 'Caustic' is stronger – it suggests sarcasm that is harsh, damaging, and deeply critical, 'burning' its target.
Yes, but it's less common. As a noun, it refers specifically to a caustic substance (e.g., 'The spillage of a caustic requires immediate neutralisation'). The adjective form is far more frequent.
Yes, they share the same Greek root 'kaiein' meaning 'to burn'. 'Cauterise' means to burn tissue to seal a wound, while 'caustic' means capable of burning or corroding.