Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Inexcusable; unpardonable: indefensible behavior.
  • adj. Invalid; untenable: an indefensible assumption.
  • adj. Vulnerable to physical attack: indefensible borders.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not defensible; not capable of being defended; vulnerable.
  • adj. Incapable of being justified or excused; inexcusable; unpardonable.
  • adj. Incapable of being explained; untenable; insupportable; invalid.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not able to be protected against attack
  • adj. (of theories etc) incapable of being defended or justified
  • adj. incapable of being justified or explained

Etymologies

in- +‎ defensible (Wiktionary)

Examples

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