infragilis
From LSJ
νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
Latin > English (Lewis & Short)
in-frăgĭlis: e, adj.,
I that cannot be broken to pieces.
I Lit.: adamas, Plin. H. N. 20 prooem. § 2.—
II Trop., strong, that cannot be weakened: vox, Ov. Tr. 1, 5, 53: animi, Sen. Vit. B. 9.
Latin > French (Gaffiot 2016)
īnfrăgĭlis,¹⁶ e, qui ne peut être brisé : Plin. 20, pr. 2