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We found 28 dictionaries with English definitions that include the word diabolical:
Click on the first link on a line below to go directly to a page where "diabolical" is defined.

General (24 matching dictionaries)

1. diabolical: Merriam-Webster.com [home, info]
2. diabolical: Oxford Dictionaries [home, info]
3. diabolical: American Heritage Dictionary of the English Language [home, info]
4. diabolical: Collins English Dictionary [home, info]
5. diabolical: Vocabulary.com [home, info]
6. diabolical: Macmillan Dictionary [home, info]
7. Diabolical, diabolical: Wordnik [home, info]
8. diabolical: Cambridge Advanced Learner's Dictionary [home, info]
9. diabolical: Wiktionary [home, info]
10. diabolical: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. diabolical: Dictionary.com [home, info]
12. diabolical: Cambridge Dictionary of American English [home, info]
13. Diabolical, The Diabolical: Wikipedia, the Free Encyclopedia [home, info]
14. Diabolical: Online Plain Text English Dictionary [home, info]
15. diabolical: Rhymezone [home, info]
16. diabolical: AllWords.com Multi-Lingual Dictionary [home, info]
17. diabolical: Webster's 1828 Dictionary [home, info]
18. diabolical: Free Dictionary [home, info]
19. diabolical: Mnemonic Dictionary [home, info]
20. diabolical: WordNet 1.7 Vocabulary Helper [home, info]
21. diabolical: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. diabolical: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

23. diabolical: Legal dictionary [home, info]

Miscellaneous (1 matching dictionary)

24. diabolical: A Word A Day [home, info]

Slang (2 matching dictionaries)

25. Diabolical: Dublin Slang and Phrasebook [home, info]
26. diabolical: Urban Dictionary [home, info]

(Note: See diabolicalness for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (diabolical) ▸ adjective:  extremely evil or cruel; expressive of cruelty or befitting hell ("Diabolical sorcerers under the influence of devils") ▸ adjective:  showing the cunning or ingenuity or wickedness typical of a devil ("The diabolical expression on his face") ▸ Also see diabolicalness ▸ Words similar to diabolical ▸ Usage examples for diabolical ▸ Popular nouns described by diabolical ▸ Words that often appear near diabolical ▸ Rhymes of diabolical ▸ Invented words related to diabolical