'glowingly' originates from the English word 'glow,' which comes from the Old English word 'glōwan,' meaning 'to shine or radiate light.'

'glōwan' transformed into the Middle English word 'glowen,' and eventually became the modern English word 'glow.'

Initially, it meant 'to shine or radiate light,' but over time it evolved into its current meaning of 'to speak with admiration or praise.'