deteriorate
C1Formal / General
Definition
Meaning
To become progressively worse in quality, condition, or value.
To decline in health, ability, or state; to degenerate. Can be used transitively (to cause something to worsen) or intransitively (to become worse).
Linguistics
Semantic Notes
Primarily describes a process of gradual worsening over time, not a sudden event. Implies a negative change from a previous, better state. The transitive use ('to deteriorate something') is less common but attested.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage.
Connotations
Slightly more common in formal writing in both varieties. The intransitive use ('the situation deteriorated') is far more frequent than the transitive use ('the attack deteriorated his health').
Frequency
Comparatively common in both BrE and AmE. Slightly higher frequency in academic and news registers.
Vocabulary
Collocations
Grammar
Valency Patterns
[intransitive] The patient's health deteriorated overnight.[intransitive] The political situation continues to deteriorate.[transitive, rare] The scandal severely deteriorated public trust in the institution.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Things took a turn for the worse.”
- “On a downward spiral.”
- “Go from bad to worse.”
Usage
Context Usage
Business
The company's financial performance deteriorated in the third quarter.
Academic
The experiment was terminated when the samples began to deteriorate.
Everyday
The weather is going to deteriorate this afternoon, so take an umbrella.
Technical
The metal's tensile strength deteriorated under prolonged exposure to salt water.
Examples
By Part of Speech
verb
British English
- The roof has deteriorated and needs urgent repair.
- Without maintenance, the footpath will deteriorate rapidly.
- The ceasefire began to deteriorate after the skirmish.
American English
- The old highway has deteriorated over the years.
- His eyesight started to deteriorate after the accident.
- Trade relations between the two countries are deteriorating.
adverb
British English
- Not applicable (No standard adverb form).
American English
- Not applicable (No standard adverb form).
adjective
British English
- The deteriorating weather forced the match to be cancelled.
- She was admitted to hospital in a deteriorating condition.
American English
- The deteriorating infrastructure is a major concern for the city.
- Officials are monitoring the deteriorating diplomatic situation.
Examples
By CEFR Level
- My grandfather's health is deteriorating.
- The old book deteriorated in the damp garage.
- If you don't paint the fence, the wood will deteriorate.
- The air quality deteriorated because of the factory smoke.
- The political dialogue deteriorated into personal insults.
- Economic conditions deteriorated sharply following the crisis.
- The architect warned that the concrete would deteriorate if the drainage issue wasn't resolved.
- Years of neglect had deteriorated the historic mansion beyond economical repair.
Learning
Memory Aids
Mnemonic
Think of a 'deteriorated' tyre (tire) – it's worn down, lost its tread, and is worse than before.
Conceptual Metaphor
HEALTH/QUALITY IS A DIRECTION (downward). STATES ARE OBJECTS (that can decay).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation of Russian 'ухудшаться' when describing a person's momentary mood ('He deteriorated' is wrong for 'Он расстроился'). Use for longer-term decline. Confusion with 'destroy' (разрушать) – 'deteriorate' implies a process, not complete destruction.
Common Mistakes
- Incorrect: 'His mood deteriorated when he heard the news.' (Too fast, use 'worsened' or 'sank'). Correct: 'His mental health deteriorated over several months.' Incorrect: 'They deteriorated the building.' (Transitive use is very rare; use 'damaged' or 'caused the building to deteriorate').
Practice
Quiz
Which sentence uses 'deteriorate' INCORRECTLY?
FAQ
Frequently Asked Questions
It is more common in formal and written contexts, but it is also understood and used in everyday speech, especially when discussing health, conditions, or situations.
Yes, but this use is much less common and can sound awkward or formal (e.g., 'The scandal deteriorated public confidence'). It is safer and more frequent to use the intransitive form ('Public confidence deteriorated').
'Deteriorate' often implies a more serious, gradual, and sometimes irreversible decline, especially in physical condition or structure. 'Worsen' is more general and can apply to any negative change, including sudden ones.
Typically, yes, it suggests a process over time. For a very rapid decline, words like 'collapse', 'plummet', or 'crash' might be more appropriate, though 'deteriorate rapidly' is also possible.