IPA: /ˈzɪpləs/
KK: /ˈzɪpləs/
Describing something that does not have a zip fastener or is free from complications and difficulties.
She wore a zipless dress that was easy to put on and take off.
Zipless → It is formed from "zip" (a colloquial term for a zipper, which is a fastening device) and "-less" (meaning without). The word "zipless" describes something that is without a zipper or lacking the fastening mechanism typically associated with zippers.
Think of something that is 'without' ('-less') a 'zipper' ('zip') — that's why zipless means lacking a zipper.