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

  • adj. Without grammatical inflection.
  • adj. Of or being a word that lacks grammatical inflection though belonging to a form class whose members are usually inflected.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. not grammatically inflected, especially if others of its class are usually inflected
  • n. A word that is not grammatically inflected.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not declinable; not varied by inflective terminations.

from The Century Dictionary and Cyclopedia

  • In grammar, not declinable; not varied by declension; showing no variety of form for case, number, or the like.
  • n. In grammar, a word that is not declined.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin indeclinabilis: compare French indéclinable. See in- not, and decline.



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  • The current definitions and examples for indeclinable do not really help me to use or understand the word. I had to google it to find a better example.

    It seems relegated to grammatical jargon, since undeclinable better captures the description of things other than words that may not be declined.

    It seems that the grammarians and linguists have taken ownership of declinable and indeclinable. The definitions in Wordnik for declinable does not even capture the meaning that is given in the example. To correct this should be an undeclinable challenge.

    March 4, 2010