indefensible

Inexcusable; unpardonable.

Invalid; untenable.

Vulnerable to physical attack.

Not defensible; that cannot be defended, maintained, or justified, by either force or speech: as, an indefensible frontier; conduct that is indefensible.

Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable

Not defensible; not capable of being defended; vulnerable.

Incapable of being justified or excused; inexcusable; unpardonable.

Incapable of being explained; untenable; insupportable; invalid.

not able to be protected against attack

(of theories etc) incapable of being defended or justified