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We found 10 dictionaries with English definitions that include the word fiendishness:
Click on the first link on a line below to go directly to a page where "fiendishness" is defined.

General (9 matching dictionaries)

1. fiendishness: Merriam-Webster.com [home, info]
2. fiendishness: Oxford Dictionaries [home, info]
3. fiendishness: Collins English Dictionary [home, info]
4. fiendishness: Wordnik [home, info]
5. fiendishness: Cambridge Advanced Learner's Dictionary [home, info]
6. fiendishness: Wiktionary [home, info]
7. fiendishness: Dictionary.com [home, info]
8. fiendishness: Free Dictionary [home, info]
9. fiendishness: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

10. fiendishness: Legal dictionary [home, info]

(Note: See fiendishly for more definitions.)

Quick definitions from WordNet (fiendishly) ▸ adverb:  as a devil; in an evil manner ▸ Also see fiendishly ▸ Words similar to fiendishness ▸ Usage examples for fiendishness ▸ Words that often appear near fiendishness ▸ Rhymes of fiendishness ▸ Invented words related to fiendishness