IPA: /ˈlɛdənli/
KK: /ˈlɛdənli/
In a way that is heavy or dull, often suggesting a lack of energy or enthusiasm.
She moved leadenly across the room, her feet dragging as if they were weighed down.
Leadenly → It is formed from "lead" (from Old English *lead*, meaning a heavy metal) and the suffix "-en" (meaning made of) combined with "-ly" (meaning in a manner). The word "leadenly" means in a manner that is heavy or sluggish, like lead.
Think of something that is 'made of lead' — that's why 'leadenly' describes a heavy or sluggish manner.