indeclinable

adjective
in·de·clin·able | \ˌin-di-ˈklī-nə-bəl \

Definition of indeclinable 

: having no grammatical inflections

First Known Use of indeclinable

14th century, in the meaning defined above

History and Etymology for indeclinable

Middle English, from Late Latin indeclinabilis, from Latin in- + Late Latin declinabilis capable of being inflected, from Latin declinare to inflect — more at decline

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The first known use of indeclinable was in the 14th century

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