Meanings
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1
adj
having the chest or breasts uncovered
Some visitors sunbathed topless on the beach.
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2
adj
lacking a roof, lid, or other upper covering
They toured the city on a topless bus.
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3
adj
extremely high or seeming to have no summit; chiefly literary
Topless cliffs rose above the narrow valley.
Thesaurus
Etymology
Formed from top and -less, literally ‘without a top.’ The word has long described things lacking an upper part; its sense ‘with the chest or breasts uncovered’ became common in the twentieth century. A literary older use means ‘immeasurably high.’