In`de*clin"a*ble (?), a. [L. indeclinabilis: cf. F. ind'eclinable. See In- not, and Decline.] Gram.
Not declinable; not varied by inflective terminations; as, nihil (nothing), in Latin, is an indeclinable noun.
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n.
An indeclinable word.
© Webster 1913.