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Webster 1913 Edition

Adj.

Without a back.

backless ‎(not comparable)

having no back, said of things that typically have backs, such as chairs or dresses
a backless surgical gown
- 1885, George Moore, A Mummer's Wife
  The apartment was almost dismantled; chairs lay backless about the floor amid china shepherdesses and toreadors; pictures were thrown over the sofa,...
(of a person) having an uncovered back, having a back that shows skin

having no back