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untenable

[uhn-ten-uh-buh l]
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adjective
  1. incapable of being defended, as an argument, thesis, etc.; indefensible.
  2. not fit to be occupied, as an apartment, house, etc.

Origin of untenable

First recorded in 1640–50; un-1 + tenable
Related formsun·ten·a·bil·i·ty, un·ten·a·ble·ness, noun

Synonyms

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1. baseless, groundless, unsound, weak, questionable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for untenable

untenable

adjective
  1. (of theories, propositions, etc) incapable of being maintained, defended, or vindicated
  2. unable to be maintained against attack
  3. rare (of a house, etc) unfit for occupation
Derived Formsuntenability or untenableness, noununtenably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for untenable

adj.

1640s, "incapable of being held against attack," from un- (1) "not" + past participle of tenable. Figurative sense is recorded from 1690s.

Online Etymology Dictionary, © 2010 Douglas Harper