in-sŏnus a, um, adj., without sound, noiseless, silent (post-class.).
I Lit.: passus, Amm. 27, 12; cf. gressus, id. 29, 5: vestigium, Ap. Met. 3, 21, 9.—
II Transf.: litterae, i. e. mutae, Ap. de Mundo, p. 66, 29.