How to Say "upset" in Spanish
The most common Spanish word for “upset” is “molesto” — use 'molesto' when you are slightly annoyed or irritated by a minor inconvenience, like losing something or being bothered..
molesto
moh-LEH-stoh/moˈlesto/

Examples
Estoy molesto porque perdí mis llaves.
I am annoyed because I lost my keys.
¿Estás molesta conmigo? No quise ofenderte.
Are you upset with me? I didn't mean to offend you. (Note: using 'molesta' for a female speaker)
Use with Estar
When describing a person's temporary feeling or state, 'molesto' always pairs with the verb 'estar': 'Ella está molesta' (She is annoyed right now).
Agreement
Like all Spanish adjectives, 'molesto' must match the gender and number of the person feeling the emotion (molesta, molestos, molestas).
Ser vs. Estar Error
Mistake: “Soy molesto.”
Correction: Estoy molesto. Saying 'Soy molesto' means 'I am an annoying person' (Definition 1), which is different from 'I feel annoyed' (Definition 2).
alterado
/al-te-RAH-doh//alteˈɾaðo/

Examples
Cálmate un poco, te veo muy alterado.
Calm down a bit, you look very upset.
El cliente se puso alterado porque el vuelo se canceló.
The customer became agitated because the flight was canceled.
Using 'estar' vs 'ser'
Use 'estar' with this word to describe a temporary mood or state of mind. Using 'ser' is very rare and would imply the person is permanently 'changed'.
Not a False Friend for 'Alternative'
Mistake: “Using 'alterado' to mean 'an alternative option'.”
Correction: Use 'alternativo' for options. 'Alterado' always means something has been changed or someone is upset.
afectado
/ah-fek-TAH-doh//afekˈtaðo/

Examples
Las zonas afectadas por la inundación necesitan ayuda.
The areas affected by the flood need help.
Él se sintió muy afectado por la noticia del accidente.
He felt very upset by the news of the accident.
Adjective Agreement
Remember to change the ending to match who or what you are describing: 'afectado' (masculine), 'afectada' (feminine), 'afectados' (plural masculine), and 'afectadas' (plural feminine).
Affected vs. Fan
Mistake: “Using 'afectado' to mean you like a hobby.”
Correction: Use 'aficionado' for 'fan.' Use 'afectado' only for someone impacted by something negative or emotional.
Annoyed vs. Agitated
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