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Webster 1913 Edition
Frightfully
Fright′ful-ly
,adv.
In a frightful manner; to a frightful dagree.
Webster 1828 Edition
Frightfully
FRIGHTFULLY
, adv.1.
Terribly; dreadfully; in a manner to impress terror and alarm; horribly.2.
Very disagreeably; shockingly. She looks frightfully to day.