There are several bands with that name:

1) Six-piece revenge band in Richmond, VA. See their Bandcamp profile for more info: https://listless.bandcamp.com/

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2) Listless was a Swedish rock band created in 2005 by Peder Kristoffersson (lead guitar) and Erik Haqvinsson (drums). The other members were Anders Adlen (bass guitar, vocals) and Michael Kjellander (rhythm guitar, vocals). They changed their name to Mersi Bowcos in Oct 2006 when they started focusing on their own creations. Kjellander started playing guitar and instead Adlén became lead singer.

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3. Listless is a band. They live in Chicago. They enjoy cats and ripping off Carissa's Wierd and Low. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.