undeclinable

English

Etymology

From un- +‎ declinable.

Adjective

undeclinable (not comparable)

1. Synonym of indeclinable

Noun

undeclinable (plural undeclinables)

1. Synonym of indeclinable

Further reading

• indeclinable, undeclinable, nondeclinable, non-declinable at the Google Books Ngram Viewer.