In dih fen sə bəl
1. not capable of being morally justified; inexcusable.
Her grossly irresponsible actions at work were indefensible, and she was promptly fired.
2. not capable of being physically defended or protected; vulnerable.
Having taken up an indefensible position, the platoon was in serious danger.
3. not capable of being rationally upheld; untenable.
Her professors considered her thesis indefensible and urged her to read more widely on the topic.
