indefensible

Definition of Indefensible in English :

1. indefensible, untenable

(of theories etc) incapable of being defended or justified

2. indefensible

not able to be protected against attack

incapable of being justified or explained

WordNet Lexical Database for English. Princeton University. 2010.

Indefensible

adjective

1.

not justifiable or excusable

2.

capable of being disagreed with; untenable

3.

incapable of defence against attack

adjective

1.

that cannot be defended or protected

2.

that cannot be justified or excused; inexcusable

adj.

1. Inexcusable; unpardonable: indefensible behavior.

2. Invalid; untenable: an indefensible assumption.

3. Vulnerable to physical attack: indefensible borders.