Also means
irritable
Usage Note
Nervioso uses estar to describe a temporary state (estoy nervioso = 'I am nervous right now') and ser to describe a habitually anxious personality (es muy nervioso = 'he is a very nervous person by nature'). The same ser/estar distinction applies to many emotional adjectives in Spanish.
Examples
"El candidato estaba nervioso antes de la entrevista."
Natural Translation
The candidate was nervous before the interview.

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