defensive

US /dɪˈfen.sɪv/
UK /dɪˈfen.sɪv/
"defensive" picture
1.

used or intended to protect someone or something from attack

:
The team played a strong defensive game.
They built a defensive wall around the city.
2.

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.
Don't be so defensive; I'm just trying to help.