Definition of "frightfully"

frightfully

/ˈfɹaɪtfəli/

adverb
comparative more frightfully, superlative most frightfully
1. In a frightful manner.
2. Very, extremely.
  Quotations
  "Really!" he said, collapsing into lassitude. "It's too frightfully hot for singing."
  1930, Norman Lindsay, Redheap, Sydney, N.S.W.: Ure Smith, published 1965, page 199