rigiditas
From LSJ
τὸ κακὸν δοκεῖν ποτ' ἐσθλὸν τῷδ' ἔμμεν' ὅτῳ φρένας θεὸς ἄγει πρὸς ἄταν → evil appears as good to him whose mind the god is leading to destruction (Sophocles, Antigone 622f.)
Latin > English (Lewis & Short)
rĭgĭdĭtas: ātis, f. rigidus,
I stiffness, hardness of wood, Vitr. 2, 9.
Latin > French (Gaffiot 2016)
rĭgĭdĭtās, ātis, f., rigidité, inflexibilité [du bois]: Vitr. Arch. 2, 9, 9.
Latin > German (Georges)
rigiditās, ātis, f. (rigidus), die Steife, Härte, des Holzes, Vitr. 2, 9, 9.