Definition of indeclinable in US English:



  • (of a noun, pronoun, or adjective in a highly inflected language) having no inflections.

    • ‘The Adverbial Compounds generally take the neuter gender and are indeclinable.’
    • ‘However, another relatively modern dictionary states that nostras is an indeclinable Latin adjective used in medicine in reference to diseases with external clinical aspects analogous to those of exotic diseases, i.e. unusual, different or strange diseases.’
    • ‘The verbal indeclinable participle may be formed from transitive and intransitive verbs.’
    • ‘In Latin, prepositions are indeclinable (they do not have endings); the object of a Latin preposition will be in either the ablative or the accusative case.’
    • ‘In the absence of a declension class (indeclinable nouns), neuter agreement is assigned.’


Late Middle English: via French from Latin indeclinabilis, from in- ‘not’ + declinabilis ‘able to be inflected’ (see decline).