topless adjective 4adverb 1noun 1forms 1 adjective4 •Lacking a top.The sight-seeing bus is topless to allow tourists a better view of the sights. •Not wearing a garment covering the top half of the body; naked from the waist up.The council voted to allow topless swimmers on the beach. •Featuring women that are naked from the waist up, often strippers or dancers.Only her closest friends knew that Jenny was working at a topless bar to help with college expenses. •(literary) Very high; towering. adverb1 •Not wearing any clothes on the upper body.'I saw her,' said Neptune, 'sunbaking topless.' — 1985 noun1 •A convertible car having the top retracted or otherwise open. formstoplesses