IPA: //ˈbriːzləs//
KK: /ˈbrizləs/
Lacking any wind or gentle air movement.
The day was hot and breezeless, making it feel even warmer outside.
Breezeless → It is formed from "breeze" (from Middle English "brese", meaning a gentle wind) and "-less" (meaning without). The word "breezeless" means without a breeze or lacking wind.
Think of being in a place where there is no gentle wind — that's what breezeless means.