How to Say "mere" in Spanish
The most common Spanish word for “mere” is “mero” — use 'mero' when 'mere' means 'nothing more than' or emphasizes the pure essence of something, often for pleasure or a basic reason.
mero
MEH-rohˈmeɾo

Examples
Lo hice por el mero placer de viajar.
I did it for the mere pleasure of traveling.
Nos vemos en el mero centro de la plaza.
I'll see you right in the center of the square.
Él es el mero jefe de la empresa.
He is the main boss of the company.
Changing for Gender
Since this is an adjective, remember to change the ending to 'mera' if the thing you are describing is feminine, like 'la mera verdad'.
Position Matters
When this word comes before a person or thing, it usually adds emphasis ('the very' or 'the mere') rather than describing a physical quality.
Using 'mero' for 'merely'
Mistake: “Es mero una broma.”
Correction: Es meramente una broma or Solo es una broma.
simple
seem-pleh'simple

Examples
Las instrucciones son muy simples.
The instructions are very simple.
Es una solución simple a un problema complicado.
It's a simple solution to a complicated problem.
Me gusta la decoración simple, sin muchos colores.
I like plain decor, without a lot of colors.
One Form for Masculine and Feminine
Good news! simple doesn't change its ending for masculine or feminine things. It's un problema simple (a masculine problem) and una solución simple (a feminine solution). You just add an 's' for plural: simples.
Describing People
Mistake: “Calling a person `simple` can sometimes be misunderstood.”
Correction: While `una persona simple` can mean 'a humble, down-to-earth person', it can also sometimes mean 'a simple-minded person'. The word `sencillo/a` is often a safer and more positive choice to describe a person's personality as 'simple' or 'unpretentious'.
Mero vs. Simple
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