The only response was the echo of an unanswered ring.
She had stopped by that afternoon but when she heard the music and the doorbell went unanswered, she assumed Fred was entertaining the competition.
Unless there was a pending crisis of major proportions, telephone messages remained unanswered and promises unfulfilled.
The ringing went unanswered, but at least the phone hadn't been disconnected.
Think of the great unanswered questions of the ages.