Not well or in good health, ailing, sick, indisposed. For example, "I am well-nigh choked with the sulfurous heat of the weather -- or I am unwell." (1826, Journal of Sir Walter Scott) See the entire definition of Unwell
Unwell is the second single from Matchbox Twenty's 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, and spent 20 weeks at the top of the U.S.