How to Say "mediocre" in Spanish
The most common Spanish word for “mediocre” is “promedio” — use 'promedio' when referring to something that is average or typical, often in a neutral or even slightly positive context, like an average level of skill or performance..
promedio
proh-MEH-deeoh/pɾoˈmeðjo/

Examples
El rendimiento promedio de los estudiantes fue aceptable.
The average performance of the students was acceptable.
El nivel promedio de habilidad es bastante alto.
The average skill level is quite high.
No queremos un resultado promedio; queremos algo excepcional.
We don't want an average result; we want something exceptional.
Ella es una corredora promedio para su edad.
She is an average runner for her age.
Adjective Placement
When used to describe a noun, 'promedio' usually comes after the noun it is describing: 'el estudiante promedio' (the average student).
Agreement with Noun
Mistake: “Using 'promedia' for feminine nouns (e.g., 'la nota promedia').”
Correction: The adjective form often acts as an invariable descriptor and usually stays 'promedio': 'la nota promedio' (the average grade). Treat it like 'estándar' (standard).
regular
/rreh-goo-LAHR//reɣuˈlaɾ/

Examples
La comida del restaurante era regular, nada especial.
The restaurant's food was so-so, nothing special.
—¿Te gustó la película? —Estuvo regular.
—Did you like the movie? —It was so-so/average.
Mi nota en el examen fue regular, no suspendí pero tampoco saqué un diez.
My grade on the exam was average; I didn't fail, but I didn't get a ten either.
La comida era bastante regular, no volvería a ese restaurante.
The food was quite mediocre/average; I wouldn't go back to that restaurant.
Expressing Feeling
When asked how you feel ('¿Cómo estás?'), answering 'Estoy regular' means you are feeling just okay or maybe slightly unwell, but not terrible.
Confusing Average with Low Quality
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