in-dēclīnābĭlis, e, adj., inflexible, unchangeable, only in a trop. sense (postAug.).
I In gen., of things: virtus animum rectum et indeclinabilem praestat, Sen. Ep. 66: justitia, id. ib. 74: series rerum, Gell. 6, 2.—Of persons: judex, Amm. 25, 4; id. 18, 1.—
II In gram.: nomen, indeclinable , Diom. pp. 288, 289 P. — Hence, indēclīnābĭlĭter , adv., unchangeably , Aug. Civ. Dei, 9, 22 fin.