fiendishly (adverb)

1. The fiendishly tempting apple in the Garden of Eden led to Adam and Eve's downfall.

2. The artist depicted the tortured face of the protagonist in the painting fiendishly.

3. The gothic cathedral was adorned with fiendishly intricate carvings and gargoyles.

4. In Greek mythology, Hades ruled the underworld with a fiendishly iron fist.