in·de·fen·si·ble

[in-di-fen-suh-buhl]
adjective
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.

Origin:
1520–30; in-3 + defensible

in·de·fen·si·bil·i·ty, in·de·fen·si·ble·ness, noun
in·de·fen·si·bly, adverb


2. vulnerable, defenseless, unprotected.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To indefensible
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Indefensible is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
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World English Dictionary
indefensible (ˌɪndɪˈfɛnsəbəl) [Click for IPA pronunciation guide]
 
adj
1.  not justifiable or excusable
2.  capable of being disagreed with; untenable
3.  incapable of defence against attack
 
indefensi'bility
 
n
 
inde'fensibleness
 
n
 
inde'fensibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

indefensible
1529, from in- "not" + defensible (see defense).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They judged that they could win even though their bottom-line position was
  indefensible on its face.
Measures based on mean proficiency are shown to be scientifically indefensible
  for high-stakes decisions.
The information as presented below is simply indefensible.
It is used as a matter of routine, established practice, and it is indefensible.
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