dēsŭētūdo, ĭnis, f. [desuesco],
discontinuance of a practice or habit, disuse, desuetude : armorum, Liv. 1, 19: bellandi, Fronto, princ. hist. p. 3, 7: desuetudine tardi, Ov. M. 14, 436; so absol. , id. Tr. 5, 7, 57; Dig. 1, 3, 32 al.
dēsuētūdō nis, f desuetus, disuse, want of practice : armorum, L.: desuetudine tardi, O. ...
An Elementary Latin Dictionary