IPA: /ˈsaɪt.ləs.nəs/
KK: /ˈsaɪt.ləs.nəs/
The state of being unable to see; a condition where a person cannot perceive visual stimuli.
Her sightlessness did not stop her from pursuing her dreams.
Sightlessness → It is formed from "sight" (from Old English "sīht", meaning the ability to see) and "-lessness" (meaning without). The word "sightlessness" means the state of being without sight or vision.
Think of 'sight' as the ability to see, and '-lessness' means without. So, sightlessness helps you remember that it refers to the condition of not being able to see.