IPA: /ˈbrɪm.ləs/
KK: /ˈbrɪm.ləs/
Describing something that does not have a brim, which is the projecting edge or border of a hat or similar item.
She wore a brimless hat that looked very stylish.
Brimless is formed from "brim" (from Old English "brymm", meaning edge or border) and "-less" (meaning without). The word describes something that does not have an edge or border, particularly in reference to a hat or container.
Think of 'brim' as the edge of something, and '-less' means without. So, brimless means without an edge.