1. indeclinable - Noun
2. indeclinable - Adjective
That one cannot decline; unavoidable.
(grammar, of a word) Not grammatically declinable.
indeclinable (plural indeclinables)
(grammar) A word that is not grammatically inflected.
For this, to draw a right line from every point, to every point, follows the definition, which says, that a line is the flux of a point, and a right line an indeclinable and inflexible flow. Proclus
Adverbial numerals Adverbial numerals are (as the name states) indeclinable adverbs, but because all of the other numeral constructions are adjectives, they are listed here with them. Source: Internet
As stated before, the rest of the numbers are indeclinable adjectives. Source: Internet
Grammatical particles Particles are indeclinable: they do not accept suffixes. Source: Internet
Instead, the indeclinable word þe main was used, often preceded by (or replaced by) the appropriate form of the article/demonstrative se main. Source: Internet
Nouns, verbs, and indeclinable words constituted the original word classes. Source: Internet