shirtless UK /ˈʃɜːtləs/US /ˈʃɝtləs/ adjective3 •Without a shirt. •Not wearing a shirt; having a bare torso, barechested.We tried to block the glare from the lunch-break o’clock sun as we watched this babe with bejeweled nails dancing with a shirtless dude in the desert while rapping. — 2019 •Very poor. formsmore shirtless · most shirtless