fiendishly

1. In a fiendish manner; evilly, wickedly.

   as a devil; in an evil manner

2. Extremely, very in harsh or negative contexts.

1. What a fiendishly clever plan!

   ruКакой дьявольски хитрый план! — Wezel

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2. It was fiendishly cold.

   ruБыло чертовски холодно. — Anilam

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3. His long, claw-like fingers danced from one part of the machine to another fiendishly, and a hideous grin distorted his features.

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regular