- s extremely evil or cruel; expressive of cruelty or befitting hell
a fiendish despot
- Mao didn't count among the fiendish four, but when the plucky Chinese I encountered talked of the Gang, they would hold up five fingers, then fold the thumb back slowly to conform .
- Death Eaters blight the skies, sent on their sorties by the fiendish Lord Voldemort, and in Harry Potter and the Half-Blood Prince, a grim fate encircles one teenage boy like a .
- All the fiendish devilry in the gangs was said to emanate from her.