What is another word for having bats in the belfry?
Pronunciation: [hˌavɪŋ bˈats ɪnðə bˈɛlfɹi] (IPA) 
The phrase "having bats in the belfry" is a colloquial expression used to describe someone who is perceived as being insane or eccentric. There are a number of other idiomatic expressions that can be used to describe such individuals, including "off their rocker," "mad as a hatter," or "absent-minded professor." Other synonyms might include "crazy," "nutty," "loopy," or "bonkers." It is important to remember that these terms are generally considered informal and may be offensive to some people, so it is always best to use them with caution and discretion. Additionally, mental health should be treated with respect and sensitivity at all times.
