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

Examples
Tu comportamiento en la escuela fue inaceptable.
Your behavior at school was unacceptable.
Es inaceptable que los precios suban tanto.
It is unacceptable that prices are rising so much.
Trabajar sin descanso es una condición inaceptable.
Working without rest is an unacceptable condition.
One Ending for All
This word ends in -e, which means it stays exactly the same whether you are describing a masculine thing (like 'el comportamiento') or a feminine thing (like 'la actitud').
Using 'Ser' for Judgment
We almost always use this word with the verb 'ser' (to be) because it describes an inherent quality or a strong judgment about a fact.
Avoid 'inaceptabla'
Mistake: “La situación es inaceptabla.”
Correction: La situación es inaceptable. Remember that adjectives ending in -e don't change to -a for feminine things.
Preposition Choice
Mistake: “Esto es inaceptable a mí.”
Correction: Esto es inaceptable para mí. Use 'para' when saying that something is unacceptable 'for' someone.
Related Translations
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