batty

[bat-ee]

adjective, bat·ti·er, bat·ti·est. Slang.

insane; crazy; eccentric.

Origin of batty

Related formsbat·ti·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for batty

batty

adjective -tier or -tiest slang

insane; crazy
odd; eccentric

Word Origin for batty

C20: from bat ²; compare the phrase have bats in the belfry
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for batty
adj.

1580s, "pertaining to bats," from bat (n.2) + -y (2). Slang sense "nuts, crazy" is attested from 1903, from the expression (to have) bats in (one's) belfry, also meaning "not be right in the head" (1899).

Online Etymology Dictionary, © 2010 Douglas Harper