When Authentic Means Not Fake, and When It Means Believable

1. Genuine

The broadest all-purpose swap: it says only that something is not fake, whether it is a gemstone, a smile or a concern. Authentic often hints that experts have checked the origin, while genuine simply rules out imitation.

Best used when: You want a plain, safe word for an object or a feeling that isn't faked.

The jeweler confirmed that the emerald was genuine.

2. Real

Plainer and more conversational than genuine. It works for objects (a real diamond) and for claims of identity, but it is too casual for a certificate or a formal report.

Best used when: You're talking, not writing a formal verdict, and the contrast is real versus imitation.

Is that a real Picasso, or a print from the gift shop?

Tone: informal

3. Bona fide

Stiffer than genuine and common in legal or business writing. It also means done in good faith, so a bona fide offer is a sincere one, not a forgery-proof one. It sits before a noun or after be, and is not hyphenated.

Best used when: You are writing formally and want to stress that a person, offer or qualification is the real thing.

She is a bona fide expert on medieval armor.

Tone: formal

4. Legitimate

Points to lawful or properly established, not to forgery. A genuine dealer and a legitimate dealer are not quite the same: the second runs a proper, lawful business, while the first only says the dealer isn't a fraud. It is a poor fit for a physical object that might be a copy.

Best used when: The question is whether a business, claim or offer has proper standing.

Check that the seller is a legitimate dealer before you send a deposit.

5. Original

Made by the named maker, not a copy, print or reproduction. Genuine rules out a fake, but original also rules out an honest, licensed copy, so a museum-shop print can be genuine without being original.

Best used when: You are separating a first-hand artwork or document from a duplicate.

The museum owns the original manuscript, not a facsimile.

6. Credible

Believable on its face: the details hang together and nothing makes you doubt them. It is milder than reliable, which implies a record of being right.

Best used when: You judge a witness, story or threat by how believable it is right now.

Correct: Her testimony was credible because the details matched the records.

Incorrect: She was too credible to question the offer.

Credible describes something that can be believed, not someone who believes too easily. For that meaning use credulous: She was too credulous to question the offer.

7. Reliable

Suggests a track record: a source that has been right before and will probably be right again. It is a step beyond credible, which only says a single claim is believable, and unlike accurate it rates the source over time rather than one set of figures.

Best used when: You're recommending a source, witness or dataset to someone who will depend on it.

A reliable source at the agency confirmed the date.

8. Trustworthy

Leans on character: the person or outlet is honest and careful, not just usually right. Compared with reliable, it says more about integrity and less about performance.

Best used when: You vouch for the honesty of a person, editor or organization that supplies information.

The editor is trustworthy and careful with her sources.

9. Accurate

Describes content that is correct in its details, such as a map, a count or a retelling. It says nothing about the source's motive, so a source can be credible in manner yet give figures that aren't accurate.

Best used when: You are judging whether specific facts or measurements are right.

The map is accurate to within a few feet.

10. Traditional

Says a dish, craft or custom follows long-established methods. Unlike authentic, it does not suggest the food comes from its home region or that anyone has vouched for it; it only says the method is old and accepted.

Best used when: You describe a dish, craft or ceremony that follows the long-used method.

They serve traditional Oaxacan mole made with a dozen ingredients.

11. Faithful

Measures a version against one specific source, such as a recipe, a translation or a remake that sticks closely to the original. It works before a noun (a faithful adaptation) or with to plus the source, and unlike traditional it needs a definite original to be faithful to.

Best used when: You are praising a remake, recipe or translation for staying close to the original.

Her paella is faithful to the recipe her grandmother used in Valencia.

12. Sincere

Fits people, apologies and feelings that are meant honestly. It is the better choice when the question is intent, where genuine would simply say the emotion isn't faked.

Best used when: You're describing an apology, compliment or person who clearly means what is said.

His apology sounded sincere, not rehearsed.

13. Unaffected

Describes a natural manner with no showing off. It is a little more formal than unpretentious, which usually describes taste, places or lifestyles. Don't confuse it with the other meaning, not influenced, as in unaffected by the storm.

Best used when: You are describing someone's manner or charm as natural and unforced.

Her manner was warm and unaffected, even with the executives.

Tone: somewhat formal