Other forms: echoingly
Something that's echoing resounds or reverberates. The echoing halls of a large building seem full of repeating, reflected sounds.
An echoing cathedral might resound with the notes sung by a choir, and a creepy haunted house could be echoing too, with mysterious bumps and groans. The adjective echoing comes from the noun echo, a "sound repeated by reflection," which is rooted in the mythical Greek figure of Echo. a nymph who pined for love until only her voice was left, echoing through the mountains.