Deteriorate and exacerbate both point downward, but their grammar sets them apart. To deteriorate is to become worse on its own — a building, health, relations, weather: no one does it, the thing simply declines. To exacerbate is to make something worse — an agent deepens an existing problem. Deteriorate is intransitive (it takes no object); exacerbate is transitive (it always needs one). Things deteriorate; people and factors exacerbate them.
The heart of this pair is transitivity. Deteriorate, from Latin deterior, 'worse', describes a thing sliding from a better state to a worse one by itself — paint deteriorates, eyesight deteriorates, discipline deteriorates. It needs no cause named and takes no object. Exacerbate needs both: an existing bad situation and an agent that worsens it. So a patient's condition deteriorates (it declines), while a delayed diagnosis exacerbates it (something makes it worse). Getting this wrong produces the classic error 'the war deteriorated the economy' — deteriorate cannot take that object; the war exacerbated, or worsened, the economy, which itself deteriorated.
deteriorate
To deteriorate is to get worse gradually — and usually to keep getting worse. Buildings deteriorate without maintenance, health deteriorates with age, relations deteriorate after an insult. The word implies a process rather than an event: not a collapse but a slide, often one that accelerates once it begins, because each loss makes the next easier. What deteriorates was once in good condition; the word always carries the memory of better days.
exacerbate
To exacerbate is to make a bad thing worse — the exact mirror of mitigate. The Latin exacerbare means 'to make bitter' (acerbus is the root of 'acerbic'), and the word's particular cruelty is that it so often describes help gone wrong: scratching exacerbates the itch, hasty fixes exacerbate the bug, emergency borrowing exacerbates the debt. What exacerbates rarely intends to — which is why the word travels with 'only', as in measures that only exacerbated the crisis.
| deteriorate | exacerbate | |
|---|---|---|
| Grammar | intransitive — takes no object | transitive — always needs one |
| Who does it | no one; the thing declines by itself | an agent or factor worsens it |
| The picture | a slide from a better past state | an existing bad thing made worse |
| Classic subjects | health, buildings, relations, weather | a problem, tension, an injury, inequality |
| From | deterior, 'worse' | exacerbare, 'to make harsh' |
| The error to avoid | 'deteriorate the economy' (no object allowed) | — (object required) |
The self-shedding bridge and the worsened fever. Deteriorate needs no hand — the bridge loses boards faster and faster all by itself, a decline that feeds on itself. Exacerbate needs both a wound and an agent — the medicine that deepens a fever already burning. Ask whether the thing worsens by itself or is worsened by something. On its own, no object: deteriorate. Made worse by an agent, with an object: exacerbate. Conditions deteriorate; neglect exacerbates them.
deteriorate
- iHis health deteriorated sharply over the winter.
- iiRelations between the two countries have deteriorated.
- iiiLeft outdoors, the timber deteriorated within a year.
exacerbate
- iThe strike exacerbated the shortage of parts.
- iiCutting the budget exacerbated an already fragile service.
- iiiLoud criticism only exacerbated his nerves.
Deteriorate belongs especially to health and diplomacy — a patient's condition deteriorates, relations between states deteriorate — where it names a slow slide watched with concern, and its noun, deterioration, is common. Exacerbation, by contrast, is a rare and awkward noun, so writers usually recast exacerbate into a clause ('which made it worse') rather than reach for the noun form at all. How exacerbate differs from aggravate and escalate — its near-neighbours in worsening — is drawn on the pages in the 'Related' list below.
The transitive/intransitive error here is a real, penalised one. 'The war deteriorated the economy' is wrong — deteriorate never takes an object; write 'the economy deteriorated' or 'the war exacerbated the recession'. Keep the pair straight in cause-and-effect sentences: the thing deteriorates, and a named factor exacerbates or worsens it. Worsen is the reliable fallback because it accepts both structures, but deteriorate and exacerbate are the higher-band words when their grammar is used correctly.