Credible vs. Credulous
“Credible” describes something or someone that is believable or convincing. “Credulous” describes a person who is too ready to believe things.
A credible claim is believable; a credulous person believes too easily.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| a claim, account, explanation, or person is believable | credible | Use for something convincing or worthy of belief. |
| a person believes too readily | credulous | Use for excessive readiness to believe. |
| you mean the ability to be believed rather than the believer’s tendency | credible | Keep the direction of the judgment clear. |
Quick tests
Meaning / construction test
Can you replace the word with “believable” or “convincing”?
If yes: Use “credible.”
If no: If you mean “too ready to believe,” use “credulous.”
Caveat: Choose by the documented meaning or construction; a different pattern may be valid in a different sentence structure or variety.
Examples
The witness gave a credible account.
The account is described as believable.
A credulous reader may accept the claim without checking it.
The reader is too ready to believe.
The explanation is credible, but the audience need not be credulous.
The sentence contrasts believability with excessive trust.
Further guidance
Core difference
Credible evaluates believability; credulous describes a person or attitude that accepts claims too readily.
Fast Test
Can you replace it with “believable”? Use credible. Can you replace it with “gullible” or “too trusting”? Use credulous.
Usage Boundary
Credulous normally has a critical implication; credible generally does not.
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.
- Credible — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Meaning of credible as believable or convincing
- Credulous — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Meaning of credulous as too ready to believe