Origin of loonyfrom lunatic
or loon·ey also lun·y Informal
adjectiveloon·i·er, loon·i·est, also lun·i·er or lun·i·est
- Extremely foolish or silly.
- Mentally deranged; crazy.
nounpl. loon·ies, or loon·eys also lun·ies
Origin of loonyShortening and alteration of lunatic or from loon 2
(comparative loonier, superlative looniest)
- An insane or very foolish person
Shortened from lunatic