For the concept related to the English word unwell, see Disease. "Unwell" is a song by American alternative rock group Matchbox Twenty. It was released in April 2003 as the second single from their third album, More Than You Think You Are. It was written by Matchbox Twenty lead singer Rob Thomas. It was very successful on the radio, spending 18 weeks at the top of the US Billboard Adult Top 40 chart, two weeks atop the Billboard Hot Adult Contemporary Tracks chart, as well as reaching No. 5 on the Billboard Hot 100 chart. The song was nominated for a Grammy Award in 2004 for Best Pop Performance by a Duo or Group with Vocal.