How to Say "slow-witted" in Spanish
The most common Spanish word for “slow-witted” is “lento” — use 'lento' when referring to a general, consistent mental slowness or a lack of quickness in processing information, similar to how you'd describe something physically slow..
lento
LEN-toh/'len.to/

Examples
No seas lento, piensa más rápido.
Don't be slow-witted, think faster.
Mi conexión a internet está muy lenta hoy, no puedo descargar nada.
My internet connection is very sluggish today, I can't download anything.
Es un poco lento para captar las indirectas.
He is a bit slow to get the hints.
Permanent vs. Temporary Slowness
Mistake: “Using *estar* for inherent mental slowness (e.g., *Mi hijo está lento*).”
Correction: If you mean a person is naturally slow-witted, use *ser*: *Mi hijo es lento*. Use *estar* only to describe a temporary condition, like a slow internet connection (*Mi wifi está lenta*).
espeso
/eh-SPEH-soh//esˈpeso/

Examples
Después de la fiesta, me sentía espeso y no podía concentrarme.
After the party, I felt slow-witted and couldn't concentrate.
Hoy no he dormido bien y estoy un poco espeso.
I didn't sleep well today and I'm a bit slow/foggy.
¡Qué tío más espeso! No para de hablar de lo mismo.
What an annoying guy! He won't stop talking about the same thing.
Perdona, estoy espeso y no entiendo la explicación.
Sorry, my brain is foggy and I don't understand the explanation.
Temporary state
When describing mental slowness, we almost always use 'estar' because it's a temporary feeling, not a personality trait.
Thinking it means 'stupid'
Mistake: “Él es espeso.”
Correction: Él está espeso. Use 'estar' to mean someone is having a slow day; 'ser' might sound like you're calling them a 'heavy' or annoying person permanently.
Lento vs. Espeso: Temporary vs. General
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