IPA: /ˈnɒt.ləs/
KK: /nɑt.ləs/
Describing something that does not have any knots or is not tied in knots.
The knotless fishing line is easier to use and less likely to tangle.
Knotless → It is formed from "knot" (from Old English *cnotta*, meaning a fastening made by tying) and "-less" (meaning without). The word "knotless" means without a knot or free from knots.
Think of being 'without' ('-less') a 'fastening' ('knot') — that's why knotless means free from knots.