Fiendish

Fiendish
- Excessively bad, unpleasant, or difficult.
- Diabolically cruel and wicked.

Image Credits : Michael Taggart 

Usage:
- Are You Smart Enough To Work At Google? Fiendish Puzzles And Impossible Interview Questions From The World’s Top Companies.
- Come December and the mercurial Chennai weather takes fiendish delight in triggering a cold-cough syndrome, targeting vocalists in particular.

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