IPA: /ˈlaɪtsəmli/
KK: /ˈlaɪtsəmli/
In a cheerful or light-hearted way; with a sense of joy or brightness.
She danced lightsomely across the stage, bringing smiles to everyone watching.
Lightsomely → It is formed from "light" (from Old English *leoht*, meaning not heavy or bright) and "-some" (meaning characterized by or having the quality of). The word "lightsomely" means in a manner that is light or cheerful.
Think of something that is 'not heavy' ('light') and 'characterized by' ('-some') a cheerful quality — that's why lightsomely means to act in a cheerful or light-hearted way.