Synonym: awful, awfully, terribly. Similar words: rightfully, frightful, delightfully, rightful, thoughtfully, insightful, delightful, thoughtful. Meaning: ['fraɪtfʊlɪ] 
adv. used as intensifiers.
adv. used as intensifiers. 
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31. Juliet Hulme: All the prizewinning grouping hit intense chests and pearl diseases . Its every frightfully romantic.
32. When his wife saw the house and furniture, she is frightfully happy.
33. It's not just a matter of looking frightfully regal on a horse, the monarch has to be able to master the radio microphone. Spectacle must not be replaced by dead air.
34. Yet did the physician, in his dark way, creep frightfully near the secret?
More similar words: rightfully, frightful, delightfully, rightful, thoughtfully, insightful, delightful, thoughtful, unthoughtful, thoughtfulness, fright, fitfully, frighten, fretfully, lustfully, tactfully, wistfully, restfully, fruitfully, boastfully, doubtfully, frighten off, frightened, regretfully, resentfully, deceitfully, respectfully, frightening, stage fright, frighten away.