indefendible
indefensible
in-
not
+
defend
defend
+
-ible
able to be
Indefendible means indefensible and can be broken down into in-0 (not0) + defend1 + -ible2 (able to be2), literally meaning 'not able to be defended'.
adjective
- indefensibleNot capable of being defended or justifiedSu comportamiento es indefendible. // His behavior is indefensible.