Not wearing a shirt. Having a bare torso.(adjective)
Very poor.(adjective)
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Use "shirtless" in a sentence
"And whether a 16-year-old boy wearing makeup and appearing (if it's true) "shirtless" is of as much concern as Miley Cyrus's new mature (read: scantily-clad) persona or the "Glee"/GQ photo spread kerfuffle."
"i mean taylor shirtless is a cause for some sort of first aid kit in the theater on opening day!!"
"Why couldn’t he remain shirtless for the indoor fight scene?"