IPA: /ˈsaɪt.ləs/
KK: /ˈsaɪt.ləs/
Not able to see; blind.
The sightless man navigated the city with the help of his guide dog.
Sightless → It is formed from "sight" (from Old English "sīht", meaning the ability to see) and "-less" (meaning without). The word "sightless" means without the ability to see or lacking sight.
Think of 'sight' as the ability to see, and '-less' means without. So, sightless describes someone who is without the ability to see.