How to Say "believable" in Spanish
The Spanish word for “believable” is “creíble” — B1 level. This is a very common word in everyday Spanish.

Examples
Tu excusa no es muy creíble.
Your excuse is not very believable.
Para ser un buen actor, tienes que ser creíble en tu papel.
To be a good actor, you have to be believable in your role.
Presentaron un argumento creíble ante el juez.
They presented a credible argument before the judge.
One Form for All
In Spanish, adjectives that end in '-e' stay the same for both men and women. You don't need to change it to 'creíbla' or 'creíblo'.
Using with 'Ser'
Since being believable is usually seen as a quality or characteristic of a thing, we almost always use the verb 'ser' (to be) instead of 'estar'.
Gender Confusion
Mistake: “La historia es creíbla.”
Correction: La historia es creíble. Even though 'historia' is feminine, words ending in -e don't change to match.
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