in·cur·a·ble

[in-kyoor-uh-buhl]
adjective
1.
not curable; that cannot be cured, remedied, or corrected: an incurable disease.
2.
not susceptible to change: his incurable pessimism.
noun
3.
a person suffering from an incurable disease.

Origin:
1300–50; Middle English < Late Latin incūrābilis. See in-3, curable

in·cur·a·bil·i·ty, in·cur·a·ble·ness, noun
in·cur·a·bly, adverb


2. unflagging, incorrigible, relentless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Incurable is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
incurable (ɪnˈkjʊərəbəl) [Click for IPA pronunciation guide]
 
adj
1.  (esp of a disease) not curable; unresponsive to treatment
 
n
2.  a person having an incurable disease
 
incura'bility
 
n
 
in'curableness
 
n
 
in'curably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

incurable
1340, from O.Fr. incurable (13c.), from L. incurabilis, from in- "not" + curabilis "curable" (see cure).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

incurable in·cur·a·ble (ĭn-ky&oobreve;r'ə-bəl)
adj.
Being such that a cure is impossible; not curable.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Such studies have served to warn people with the incurable disorder.
Indeed, incurable motor-neuron disease has confined you to a wheelchair and
  caused you to lose the ability even to speak.
While treatable, the disease had progressed to a stage that's incurable.
For a long time, tuberculosis was a gruesome and incurable disease.
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