How to Say "nervous" in Spanish
The most common Spanish word for “nervous” is “nervioso” — use this word when you are feeling anxious, agitated, or stressed about a specific situation..
nervioso
/nair-vee-OH-soh//neɾˈβjoso/

Examples
Estoy nervioso por la entrevista de trabajo de mañana.
I am nervous about tomorrow's job interview.
Mi hermana está muy nerviosa antes de subir al escenario.
My sister is very anxious before going up on stage.
No te pongas nervioso; todo va a salir bien.
Don't get nervous; everything is going to turn out well.
El sistema nervioso central controla el cuerpo.
The central nervous system controls the body.
Agreement is Key
Since 'nervioso' is an adjective, you must change the ending to match the person or thing you are describing. Use '-a' for feminine words (nerviosa), and '-os' or '-as' for plurals (nerviosos, nerviosas).
Use 'Estar' for Feelings
To express feeling nervous, always use the verb 'estar' (to be) because it describes a temporary emotional state, not a permanent characteristic.
Always Describes Nerves
In this usage, 'nervioso' describes something that is literally part of the body's nerve structure, like organs or cells. It functions like an English adjective.
Using 'Ser'
Mistake: “Soy nervioso.”
Correction: Estoy nervioso.
ansioso
/ahn-SYOH-soh//anˈsjo.so/

Examples
Mi hermana está ansiosa por su entrevista de trabajo mañana.
My sister is anxious about her job interview tomorrow.
Estábamos ansiosos esperando la llamada del médico.
We were anxiously waiting for the doctor's call.
Adjective Agreement
Like all Spanish adjectives, 'ansioso' must change its ending to match the person or thing it describes: 'ansioso' (masculine singular), 'ansiosa' (feminine singular), 'ansiosos' (masculine plural), 'ansiosas' (feminine plural).
Confusing 'Anxious' Meanings
Mistake: “Using 'ansioso' when you simply mean 'eager' (Definition 2) but forgetting the preposition.”
Correction: When meaning 'worried,' you often use 'ansioso POR' + noun. When meaning 'eager,' it's common to use 'ansioso POR' or 'ansioso DE' + infinitive.
nervioso
Examples
El sistema nervioso central controla el cuerpo.
The central nervous system controls the body.
Confusing 'Nervioso' and 'Ansioso'
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