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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.


the 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
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Throwing together two of movieland's most eccentric talents was always likely to produce a perfect storm of battiness, and the marriage of Werner Herzog and Nicolas Cage is precisely that.
This confirmed we were in safe hands for this very British tradition of seasonal battiness.
While Steve Carell (star of The-40-Year Old Virgin) is extremely good at times, his character doesn't always fit easily with the general battiness of the Hoover clan.