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[in-di-klahy-nuh-buh l] /ˌɪn dɪˈklaɪ nə bəl/
adjective, Grammar.
not capable of being declined; having no inflected forms: used especially of a word belonging to a form class most of whose members are declined, as the Latin adjective decem, “ten.”.
Origin of indeclinable
late Middle English
1400-50; late Middle English < Latin indēclīnābilis unchangeable, inflexible. See in-3, declinable
Related forms
indeclinableness, noun
indeclinably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for indeclinable
Historical Examples
  • Of these, the first five are declinable; the other four are indeclinable.

    Elements of Gaelic Grammar Alexander Stewart
  • The genitives his (his, its), hiere (her), hiera (their) are used as indeclinable possessives.

    Anglo-Saxon Primer

    Henry Sweet
  • Mīlle is regularly an adjective in the Singular, and indeclinable.

    New Latin Grammar Charles E. Bennett
  • The indeclinable, remain as simple adjuncts to the verbs, and the latter put on the negative form.

    The Indian in his Wigwam Henry R. Schoolcraft
British Dictionary definitions for indeclinable


(of a noun or pronoun) having only one form; not declined for case or number
Derived Forms
indeclinableness, noun
indeclinably, 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
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Word Origin and History for indeclinable

late 14c., originally in grammar, from French indéclinable, from Latin indeclinabilis, from indeclinatus "unchanged, constant," from in- "not, opposite of" (see in- (1)) + declinatus, from declinare (see decline (v.)). Related: Indeclinably.

Online Etymology Dictionary, © 2010 Douglas Harper
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