Definition of "busily"

But these sweet thoughts do ever refresh my labours,/ Most busil'est when I do it.

1610-11?, Shakespeare, The Tempest, Act III, scene i

Look at the little fellows, mere bundles of fluff, paddling along so busily and sturdily.

1934, Henry G. Lamond, An Aviary on the Plains, Sydney: Angus and Robertson, page 5

Quite a crowd of townspeople turned out to see the train start, and several pressmen were busily engaged in taking notes and photographs.

1949 November and December, “Notes and News: By Special Train to Llanfair”, in Railway Magazine, page 409