gruesomely, frightfully, dreadfully; threateningly
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Fearsomely Definition from Language, Idioms & Slang Dictionaries & Glossaries
Adverb
1. in a fearsome manner; "a sabre slammed fearsomely through the thicket in all directions"
(pertainym) awful, dire, direful, dread(a), dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible
