There are 2 definitions of batty in English:

batty1

Syllabification: bat·ty
Pronunciation: /ˈbatē
 
/

adjective (battier, battiest)

informal
Crazy; insane: you’ll drive me batty!
More example sentences
  • I expected her to be all talked out on the subject of her great love; in fact she mentions Gainsbourg first, then evokes his memory repeatedly over the next hour, in which she's charming, if somewhat batty, company.
  • When I'm old and grey and either too batty, too jaded or simply too wise to care much about social propriety and the trivia of a speeding fine, I will be buying myself a Micra and the A-roads will be mine.
  • I looked at the audience and thought: how come it is always these people, or their fathers, grandfathers, cousins and batty aunts, who find their way into clubs?
Synonyms
insane, out of one's mind, crazed; eccentric, peculiar

Origin

early 20th century: from bat2 + -y1. Compare with bats.

Derivatives

battily

Pronunciation: /ˈbatəlē/
adverb
More example sentences
  • She smiles somewhat battily and nods: ‘I'm the one with personality!’
  • Sadly, she was too battily flustered to provide me with the recipe.
  • At one level there is something battily wonderful about this attitude - but it is also appalling.

battiness

noun
More example sentences
  • This particular newspaper - for argument's sake, let's call it the Daily Express - often contains views of extreme toxicity and general battiness.
  • The dozen books of Rumpole short stories endure as a gorgeous chronicle of English class battiness and the absurdities of the law.
  • She is an eccentric in the fashion of a good many English women who have taken to the East, i.e. a mixture of battiness and extreme practicality.

Definition of batty in:

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Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of batty in English:

batty2

Line breaks: batty

Entry from British & World English dictionary

noun

West Indian informal
A person’s bottom.

Origin

1930s: representing a pronunciation of botty.

Definition of batty in: