Lightless
Lightless adjective - Giving no light.
Usage example: lightless stars `visible' only to radio antennae
Cite this Source
Unseeable and Lightless. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/lightless/unseeable
Lightless & Unseeable. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/lightless/unseeable>.
Unseeable or Lightless. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/lightless/unseeable.
Google Ngram Viewer shows how "lightless" and "unseeable" have occurred on timeline