Hypertext Webster Gateway: "bats"
From WordNet (r) 1.7 (wn)
bats
adj : informal or slang terms for mentally irregular [syn: {balmy},
{barmy}, {batty}, {bonkers}, {buggy}, {cracked}, {crackers},
{daft}, {dotty}, {fruity}, {haywire}, {kooky}, {kookie},
{loco}, {loony}, {loopy}, {nuts}, {nutty}, {wacky}]
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