IPA: /ˈslɪtləs/
KK: /slɪtləs/
Describing something that does not have a slit or opening.
The slitless design of the fabric made it more durable and resistant to wear.
Slitless → It is formed from "slit" (from Old English *slytan*, meaning to cut or split) and "-less" (meaning without). The word "slitless" means without a slit or cut.
Think of something that is 'without' ('-less') a 'cut' ('slit') — that's why slitless means having no slit.