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comparative more diabolically, superlative most diabolically
In a diabolical manner. quotations examples
Two recent books, one by Mr. Grant White on England, one on France by the diabolically clever Mr. Hillebrand, may well have set people thinking on the divisions of races and nations.
1887, Robert Louis Stevenson, “The Foreigner At Home”, in Memories and Portraits, New York: Charles Scribner, page 1