sonore
Could not find sonorem in Logeion dictionaries. Looking for closest alphabetic form.
sŏnōrē, adv., v. sonorus fin.
sonōrē, Adv. (sonorus), schallend, tönend, Gell. 4, 20, 8.
sŏnōrē (sonorus), dʼune manière sonore : Gell. 4, 20, 8.