Exciting, astonishing, frightening, or horrifying.(adjective)
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Use "hair-curling" in a sentence
"Annis - I haven't read the Ariana Franklin books but have read some hair-curling things about them..."
"For a concise, hair-curling summary of how (if not, fully, why) we invaded Iraq, one can do worse than read Mark Danner's long, great essay "Iraq: The War of the Imagination" in the current issue of the New York Review of Books."
"For a truly hair-curling reading experience, gaze at Revelation Unveiled, by Tim Yes-That-Tim LaHaye."