from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Informal Variant of loony.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. crazy; mentally unsound
from the GNU version of the Collaborative International Dictionary of English
- adj. Crazy; insane; mentally unsound.
from The Century Dictionary and Cyclopedia
- Lunatic; crazy; silly and erratic: usually applied to partial or temporary aberration, and to persons afflicted with partial lunacy. Used also as a noun.
Diminutive of lunatic with -y. (Wiktionary)