We found 27 dictionaries that define the word diabolical:

General (22 matching dictionaries)

1. diabolical: Merriam-Webster
2. diabolical: Oxford Learner's Dictionaries
3. diabolical: American Heritage Dictionary of the English Language
4. diabolical: Collins English Dictionary
5. diabolical: Vocabulary.com
6. Diabolical, diabolical: Wordnik
7. diabolical: Cambridge Advanced Learner's Dictionary
8. diabolical: Wiktionary
9. diabolical: The Wordsmyth English Dictionary-Thesaurus
10. diabolical: Dictionary.com
11. diabolical: Cambridge Essential American English Dictionary
12. Diabolical, The Diabolical: Wikipedia, the Free Encyclopedia
13. Diabolical: Online Plain Text English Dictionary
14. diabolical: Rhymezone
15. diabolical: AllWords.com Multi-Lingual Dictionary
16. diabolical: Webster's 1828 Dictionary
17. diabolical: FreeDictionary.org
18. diabolical: Mnemonic Dictionary
19. diabolical: TheFreeDictionary.com
20. diabolical: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

21. diabolical: Legal dictionary

Miscellaneous (1 matching dictionary)

22. diabolical: A Word A Day

Slang (3 matching dictionaries)

23. diabolical: Green’s Dictionary of Slang
24. Diabolical: Dublin Slang and Phrasebook
25. diabolical: Urban Dictionary

(Note: See diabolically as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Extremely wicked or cruel. ▸ adjective:  Of or concerning the devil; satanic. Similar: Mephistophelian, satanic, diabolic, devilish, demonic, hellish, infernal, fiendish, wicked, evil, more... Opposite: angelic, divine, good, benevolent, virtuous Types: evil, malicious, sinister, wicked, nefarious, fiendish, satanic, demonic, infernal, more... Phrases: Professor Layton and the Diabolical Box, Diabolical Fullmoon Mysticism, diabolical deeds, diabolical one, more... Colors:     crimson,     blood red,     black,     dark purple,     midnight blue, more... ▸ Words similar to diabolical ▸ Usage examples for diabolical ▸ Idioms related to diabolical ▸ Wikipedia articles (New!) ▸ Popular nouns described by diabolical ▸ Words that often appear near diabolical ▸ Rhymes of diabolical ▸ Invented words related to diabolical