a. [ L. indeclinabilis: cf. F. indéclinable. See In- not, and Decline. ] (Gram.) Not declinable; not varied by inflective terminations; as, nihil (nothing), in Latin, is an indeclinable noun. -- n. An indeclinable word. [ 1913 Webster ]
adv. 1. Without variation. [ 1913 Webster ]
2. (Gram.) Without variation of termination. [ 1913 Webster ]