unlined

/AH0 N L AY1 N D/
adjective
  1. 1

    Without lining; without liner.

    โ€œThe bitter wind made me wish I hadn't opted for that unlined coat.โ€

  2. 2

    Unmarked by lines, especially of the skin.

    โ€œEven on her 70th birthday, her skin remains unlined.โ€

Source: https://en.wiktionary.org/wiki/unlined