In an occupied or engaged manner; while actively working or moving about with purpose.
From 'busy' plus the adverbial suffix '-ly,' which converts adjectives to adverbs. The '-ly' ending comes from Old English '-lice' meaning 'in the manner of.'
The adverb 'busily' creates a picture of purposeful activity—notice how 'busily working' sounds more industrious than just 'working,' adding a sense of focused energy and intention.
Complete word intelligence in one call. Free tier — 50 lookups/day.