What does "sightless" mean?

Sightless: That can not be seen; invisible. [Obs.] The sightless couriers of the air. Shak.

Additional senses

  1. 2.Offensive or unpleasing to the eye; unsightly; as, sightless stains. [R.] Shak. -- Sight"less*ly, adv.- Sight"less*ness, n.

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