defensive

adjective
  1. Used or intended to defend or protect. adjective
    The castle had a strong defensive wall.
    The team focused on their defensive strategy to prevent the opponents from scoring.
  2. Behaving in a way that shows you feel people are criticizing you. adjective
    She became defensive when asked about her decision.
    His defensive attitude made it difficult to discuss the issue openly.
  3. A position or attitude of defense or resistance. noun
    The army took up a defensive to protect the city.
    They were on the defensive throughout the debate.