What is "hollower"

Usage examples of "hollower".

As we got more and more into debt breakfast became a hollower and hollower form, and, being on one occasion at breakfast-time threatened (by letter) with legal proceedings, “not unwholly unconnected,” as my local paper might put it, “with jewellery,” I went so far as to seize the Avenger by his blue collar and shake him off his feet – so that he was actually in the air, like a booted Cupid – for presuming to suppose that we wanted a roll.

He passed on, and the lights and cries of the station dropped away, merged in a wider haze and a hollower resonance, as the train gathered itself up with a long shake and rolled out again into the darkness.