Sightless \Sight"less\, a. 1. Lacking sight; without sight; blind. [1913 Webster] Of all who blindly creep or sightless soar. --Pope. [1913 Webster] 2. That can not be seen; invisible. [Obs.] [1913 Webster] The sightless couriers of the air. --Shak. [1913 Webster] 3. Offensive or unpleasing to the eye; unsightly; as, sightless stains. [R.] --Shak. [1913 Webster] -- {Sight"less*ly}, adv.- {Sight"less*ness}, n. [1913 Webster]