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comparative more mightily, superlative most mightily
In a mighty manner; with strength or force. examples
Enormously, to a great extent. quotations examples
The Billingham fertiliser traffic has grown mightily in the past few seasons.
1960 September, G. Freeman Allen, “I.C.I. fertiliser goes by rail from Tees-side”, in Trains Illustrated, page 533
(US, regional) Thoroughly; entirely. examples