Of, resembling, or characteristic of a devil, as:(adjective)
Mischievous, teasing, or annoying.(adjective)
Excessive; extreme: devilish heat. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "devilish" in a sentence
"You may be in devilish fine form to-day, but your throat is rotten."
"Sometimes an otherwise calm and serene person gathers a look that can best be described as devilish."
"A divine love which had in it no necessity of hating evil would be profoundly immoral, and would be called devilish more fitly than divine."