Incredible vs. Incredulous
Both words relate to belief, but they point in different directions: the thing may be incredible; the person reacting to it may be incredulous. “Incredible” also has a common intensifying sense meaning exceptionally impressive or extreme.
Use “incredible” for something that is hard to believe or, informally, remarkable. Use “incredulous” for a person, expression, voice, or reaction that shows disbelief.
Key details
Choose the right form
| Meaning / context | Use | Decision |
|---|---|---|
| thing, claim, event, or result that is hard to believe | incredible | The adjective describes what prompts disbelief. |
| person, look, tone, or reaction showing disbelief | incredulous | The adjective describes the believer or reaction. |
| remarkably good, large, or striking thing | incredible | This common intensifying sense does not mean the thing is false. |
Quick tests
Decision test
Does the adjective describe the person or reaction that is having difficulty believing something?
If yes: Use “incredulous.”
If no: If it describes the thing that is hard to believe or remarkably striking, use “incredible.”
Caveat: Do not define “incredible” simply as false or “incredulous” as unbelievable; the target of the adjective is the key distinction.
Examples
She gave him an incredulous look after hearing the claim.
The look shows the person’s disbelief.
The rescue involved an incredible sequence of events.
The events are described as unusually difficult to believe or remarkable.
The concert had an incredible finale.
Here “incredible” is an intensifier for something remarkable.
Further guidance
Core difference
The adjective describes what prompts disbelief.
Fast Test
Use “incredulous.” If it describes the thing that is hard to believe or remarkably striking, use “incredible.”
Usage Boundary
Do not define “incredible” simply as false or “incredulous” as unbelievable; the target of the adjective is the key distinction.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- incredible (opens in a new tab)Cambridge University Press · Incredible can mean impossible or very difficult to believe and also functions as an intensifier for something unusually good, bad, large, or extreme.
- incredulous (opens in a new tab)Cambridge University Press · Incredulous describes a person, expression, or reaction showing unwillingness or inability to believe something.