I / in-flexĭbĭlis
adjective

in-flexĭbĭlis

neut. in-flexĭbĭle
that cannot be bent; inflexible
that cannot be bent, inflexible.
lockjaw
Lit.: dolor (cervicum), lockjaw = opisthotonos, Plin. 28, 12, 52, § 192; cf. Cael. Aur. Acut. 3, 6, 65.—
by extension
Transf.: judicium, unchangeable, Sen. Ep. 95: obstinatio, Plin. Ep. 10, 97, 3.