shirtless
adj. B1 Intermediate UK //ʃˈɜːtləs// shirt·less
adj. not wearing a shirt or any clothing on the top half of the body.
adj. lacking a shirt or upper-body covering. Often used predicatively after linking verbs like 'be' or 'remain'.
He is shirtless because it is very hot outside.
The lifeguard spent the entire afternoon shirtless while watching the swimmers at the crowded beach.
The actor appeared shirtless in several scenes to emphasize the physical transformation he underwent for the role, showcasing a level of fitness that required months of strict dieting.
From shirt + -less.
Usage
Typically used as a predicative adjective following a linking verb, though it can also appear attributively before a noun.