Adverb
In a frightful manner; to a frightful dagree.
Source: Webster's dictionaryOur efforts in chess attain only a hundredth of one percent of their rightful result...Our education, in all domains of endeavour, is frightfully wasteful of time and values. Emanuel Lasker
It is frightfully difficult to know much about the fairies, and almost the only thing for certain is that there are fairies wherever there are children. J. M. Barrie
It's frightfully important for a writer to be his age, not to be younger or older than he is. One might ask, "What should I write at the age of sixty-four," but never, "What should I write in 1940." W. H. Auden
You're a historian. Tell me if there are any bath-tubs in history. I think they've been frightfully neglected. F. Scott Fitzgerald
‘You're frightfully BBC in your language this afternoon, Albert,' said Tuppance, with some exasperation. Albert looked slightly taken aback and reverted to a more natural form of speech. ‘I was listening to a very interesting talk on pond life last night,' he explained. Agatha Christie
I have only ever read one book in my life, and that is White Fang. It's so frightfully good I've never bothered to read another. Nancy Mitford