defensible
US /dɪˈfen.sə.bəl/
UK /dɪˈfen.sə.bəl/

1.
able to be protected against attack
:
•
The castle was built on a highly defensible hill.
•
They chose a strategic location that was easily defensible.
2.
able to be justified or supported by argument
:
•
His actions were not morally defensible.
•
The company's decision was legally defensible.