fiendishly
Adverb
Meaning
as a devil; in an evil manner
Source: WordNetSynonyms
Antonyms
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Cancer is such a ruthless adversary because it behaves as if it has its own fiendishly cunning agenda.
Men have fiendishly conceived a heaven only to find it insipid, and a hell only to find it ridiculous.
his writing could be diabolically satiric
According to WhatsApp, it’s because of a technical knot that’s fiendishly difficult to unpick.
As far as I am concerned with pizza simplicity is best and freshness paramount and you'd better have a fiendishly hot oven too.
Because of varying domestic rules on tariff retaliation, coordinating any action between several countries "quickly becomes fiendishly difficult," the diplomat said.