“credible” vs. “credulous”

Use "credible" to describe a claim, story, or source as believable, and use "credulous" to describe a person as too easily convinced or gullible. If the sentence is judging whether a claim deserves belief, reach for credible; if it is judging whether a person is too easily fooled, reach for credulous, since the two words describe opposite sides of the same act of believing.

The real distinction

This is a genuinely important distinction because the two words describe opposite ends of the same transaction: "credible" is a property of the claim or source (is it worthy of belief?), while "credulous" is a property of the audience or listener (are they too willing to believe, regardless of evidence?). A credible story might still be met with a credulous audience who would have believed it even without good evidence, and conversely, a genuinely incredible (not credible) claim might still find a credulous audience willing to accept it uncritically. Confusing the two produces a real logical error, not just a spelling slip — saying "the credulous report was widely trusted" when you mean "the credible report" reverses the entire meaning, implying the report itself was gullible rather than trustworthy, which doesn't even make sense, since only people (or, figuratively, groups of people) can be credulous, never a document or claim itself. A reliable check: ask whether the word is describing a person's mental disposition (open to being fooled) or a fact, story, or source's inherent trustworthiness — the former needs "credulous," the latter needs "credible." Editors treat this swap as a meaningful comprehension error rather than a cosmetic one, since it reverses who or what is actually being judged in the sentence. It is worth adding that journalists in particular must watch this distinction closely, since describing a whistleblower's claims as credulous rather than credible would wrongly suggest the whistleblower is gullible rather than that their account deserves to be believed, a mistake serious enough that careful editors treat it as a factual error rather than a stylistic quibble.

Examples with “credible”

• The prosecutor presented a credible timeline of events.
• Her credible testimony helped convince the jury.
• The plan seemed credible enough to secure funding.
• Analysts found the company's forecast entirely credible.
• A credible source confirmed the merger talks.
• The evidence made the defense's account far more credible.
• His credible explanation put the committee's doubts to rest.
• The report's findings were considered highly credible by experts.

Examples with “credulous”

• The credulous investors ignored every warning sign.
• He was far too credulous to spot the obvious scam.
• Credulous shoppers fell for the fake discount emails.
• The con artist specifically targeted credulous elderly victims.
• She was surprisingly credulous about the psychic's claims.
• The credulous crowd believed every word of the pitch.
• His credulous nature made him an easy target for scammers.
• Being credulous online can cost you far more than money.

Memory trick

Think of "credible" as describing the message — a credible story stands on its own evidence. Think of "credulous" as describing the messenger's audience — a credulous listener would believe almost anything, evidence or not. If the sentence is judging a claim, use credible; if it's judging a person's gullibility, use credulous, since only people (or groups) can actually be credulous. One more helpful anchor: credulous rhymes loosely with gullible in both syllable count and overall feel, a pairing worth remembering whenever you are describing a person's excessive willingness to believe rather than describing the believability of a claim itself.