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We found 32 dictionaries with English definitions that include the word loony:
Click on the first link on a line below to go directly to a page where "loony" is defined.

General (28 matching dictionaries)

1. loony: Merriam-Webster.com [home, info]
2. loony: Oxford Learner's Dictionaries [home, info]
3. loony: American Heritage Dictionary of the English Language [home, info]
4. loony: Collins English Dictionary [home, info]
5. loony: Vocabulary.com [home, info]
6. loony, loony: Macmillan Dictionary [home, info]
7. Loony, loony: Wordnik [home, info]
8. loony: Cambridge Advanced Learner's Dictionary [home, info]
9. loony: Wiktionary [home, info]
10. loony: Webster's New World College Dictionary, 4th Ed. [home, info]
11. loony: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. loony: Infoplease Dictionary [home, info]
13. Loony, loony: Dictionary.com [home, info]
14. loony: Online Etymology Dictionary [home, info]
15. loony: UltraLingua English Dictionary [home, info]
16. loony: Cambridge Dictionary of American English [home, info]
17. Loony: Wikipedia, the Free Encyclopedia [home, info]
18. Loony: Online Plain Text English Dictionary [home, info]
19. loony: Webster's Revised Unabridged, 1913 Edition [home, info]
20. loony: Rhymezone [home, info]
21. loony: AllWords.com Multi-Lingual Dictionary [home, info]
22. loony: Free Dictionary [home, info]
23. loony: Mnemonic Dictionary [home, info]
24. loony: WordNet 1.7 Vocabulary Helper [home, info]
25. loony: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. loony: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

27. loony: Legal dictionary [home, info]

Computing (1 matching dictionary)

28. loony: Encyclopedia [home, info]

Slang (2 matching dictionaries)

29. loony: English slang and colloquialisms used in the United Kingdom [home, info]
30. loony: Urban Dictionary [home, info]

(Note: See loonys for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (loony) ▸ noun:  someone deranged and possibly dangerous ▸ adjective:  informal or slang terms for mentally irregular ▸ Also see loonys ▸ Word origin ▸ Words similar to loony ▸ Usage examples for loony ▸ Idioms related to loony (New!) ▸ Popular adjectives describing loony ▸ Popular nouns described by loony ▸ Words that often appear near loony ▸ Rhymes of loony ▸ Invented words related to loony