IPA: //ˈbiːmɪli//
KK: /ˈbimli/
In a way that shows happiness or joy, often with a bright smile.
She smiled beamily at her friends during the celebration.
The word 'beamily' is derived from 'beam' (from Old English 'bēam', meaning tree or beam) and the suffix '-ly' (meaning in a manner of). The term 'beamily' refers to something done in a manner that is cheerful or bright, akin to the warmth and light of a beam.
Think of a 'beam' of light that brings cheerfulness and brightness, and remember that 'beamily' means doing something in a cheerful manner.