hollow [hollower, hollowest](echoing, reverberating, as if in a hollow space) adjective [UK: ˈhɒ.ləʊ] [US: ˈhɑːlo.ʊ]
resonant(resounding, echoing) adjective [UK: ˈre.zə.nənt] [US: ˈre.zə.nənt]John's deep voice is so resonant and mellifluous that I could spend hours listening to him read aloud from the phone book. = La voz profunda de John es tan meliflua y resonante que podría pasarme horas escuchándole leer la guía telefónica.
resounding(having a deep, reverberating sound) adjective [UK: rɪ.ˈzaʊnd.ɪŋ] [US: ri.ˈsaʊnd.ɪŋ]