Definition of "fearfully"
adverb
comparative more fearfully, superlative most fearfully
(UK, dated) very; very much.
Quotations
Remember, when a horse is on its side the kicking-strap is useless, and the breechen nearly so, to prevent the swing of its hind legs; your aim is to get it away from the steps or wheel-plate of the trap, which, in its struggles, may cut its legs fearfully.
1 November 1884, John Kemp, Saddlers, Harness Makers, and Carriage Builders' Gazette, volume XIV, London, pages 155–6