bat·ty
(băt′ē)adj. bat·ti·er,
bat·ti·est Informal Mentally deranged; crazy.
[From bats in the belfry.]
bat′ti·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
battiness
(ˈbætɪnəs) nthe characteristic of being batty; craziness; insanity; eccentricity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014