Artificial intelligent assistant

backless

backless, a.
  (ˈbæklɪs)
  [f. back n. + -less.]
  a. Without a back, having no back.

1823 Blackw. Mag. Oct. 470/2 Bare benches, and backless seats. 1827 Southey Lett. (1856) IV. 79 A car (which must not have been backless). 1882 Harper's Mag. LXIV. 786 Narrow backless benches.

  b. Applied to a woman's garment cut low at the back.

1926 C. Beaton Diary 18 Oct. in Wandering Years (1961) 142 She [sc. Teddie Gerrard] innovated backless dresses and huskily croaked, ‘We're so glad to see you're back, dear lady!’ 1960 Harper's Bazaar Oct. 52 A backless, strapless foundation with a contour bust.

Oxford English Dictionary

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