backless

Pronunciation: /ˈbækləs/

The English word “backless” has 2 meanings listed here.

adjective

Having no back, especially where one would be expected, as with a chair or a dress.
Having the back uncovered, showing the skin.

From back + -less.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.