adjective Date: 1529 perversely diabolical , extremely cruel or wicked, excessively bad, unpleasant, or difficult , ~ly adverb ~ness noun
FIENDISH
Meaning of FIENDISH in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012