How to Say "never ever" in Spanish
The Spanish word for “never ever” is “jamás” — A2 level. This is a very common word in everyday Spanish.

Examples
Jamás he visto una película tan buena.
I have never seen such a good movie.
No te olvidaré jamás.
I will never forget you.
¿Has probado el helado de aguacate? — Jamás, ¡qué raro!
Have you tried avocado ice cream? — Never, how weird!
The Spanish "Double Negative"
In Spanish, it's correct to use 'no' with words like 'jamás'. If 'jamás' comes BEFORE the verb, you don't need 'no'. If it comes AFTER, you MUST use 'no'. Example: 'Jamás voy' and 'No voy jamás' both mean 'I never go'.
Jamás vs. Nunca
Think of 'jamás' as a stronger, more emotional version of 'nunca' (never). They often mean the same thing, but 'jamás' adds more emphasis, like saying 'never EVER'.
Forgetting the 'no'
Mistake: “Mi hermano come jamás verduras.”
Correction: Mi hermano no come jamás verduras. (OR) Mi hermano jamás come verduras. If you put 'jamás' after the action word (the verb), you need to put 'no' in front of it.
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