defensive
US /dɪˈfen.sɪv/
UK /dɪˈfen.sɪv/

1.
defensivo, protector
used or intended to protect someone or something from attack
:
•
The team played a strong defensive game.
El equipo jugó un partido defensivo fuerte.
•
They built a defensive wall around the city.
Construyeron un muro defensivo alrededor de la ciudad.
2.
a la defensiva, defensivo
very anxious to protect what you believe is right and to make sure that no one criticizes you
:
•
He became very defensive when I questioned his decision.
Se puso muy a la defensiva cuando cuestioné su decisión.
•
Don't be so defensive; I'm just trying to help.
No seas tan defensivo; solo estoy tratando de ayudar.