Pronunciation: (in"di-fen'su-bul), [key]
1. not justifiable; inexcusable: indefensible behavior.
2. incapable of being protected or defended against attack: an indefensible town.
3. incapable of being defended against criticism or denial; untenable: indefensible argument.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.