In a fearful manner; characterized by fear.
I stepped fearfully into the pitch-dark cave.
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(UK, dated) very; very much.
He's a fearfully good striker.
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Add your own interpretation of "fearfully".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.