Definition

Adverb: * In an extremely difficult, complex, or unpleasant way: Used to emphasize the extreme degree of something, often a challenge or negative quality. * In a wickedly clever or cruel manner: Suggests something is done with a cunning, malicious, or devilish intelligence.

Usage and Examples

• Emphasizing extreme difficulty or complexity:
  • The final exam was fiendishly difficult.
  • She solved the fiendishly complicated puzzle in record time.
  • The lock was fiendishly hard to pick.
• Describing wicked cleverness or cruelty:
  • The villain laughed fiendishly as his plan unfolded.
  • The question was designed fiendishly to trap the unwary.
  • He was fiendishly clever at manipulating people.

Advanced Usage

• "fiendishly clever": A common collocation describing an extreme, almost unnatural level of cunning intelligence.
  • The detective's opponent was a fiendishly clever criminal.
• Used as an intensifier similar to "devilishly," "diabolically," or "extremely," but often with a connotation of malicious ingenuity or excessive challenge.

Variants and Related Words

• Fiendish (adjective): Extremely cruel or unpleasant; clever and complicated.
  • a fiendish plot, a fiendish problem
• Fiend (noun): An evil spirit or demon; a very cruel or wicked person; (informal) a person who is very enthusiastic about something.
  • a drug fiend, a crossword fiend

Synonyms

• Diabolically: In a devilish or wicked manner.
• Devilishly: In a clever and slightly evil way; (informal) extremely.
• Wickedly: In an evil or morally wrong manner; (informal) extremely.
• Extremely: To a very high degree.
• Exceedingly: To an extreme degree.

Notes on Meaning

While the core meaning relates to devilish evil ("in an evil manner"), in modern usage, fiendishly is most commonly employed as a strong intensifier for words like "difficult," "complex," or "clever," often losing the direct connotation of literal evil and instead emphasizing an extreme, daunting, or ingeniously tricky quality.

Adverb

1. as a devil; in an evil manner
   • his writing could be diabolically satiric