Immanurable

A person or animal that doesn't give a shit.

Indifference, uncaring

Joe is immanurable about what his boss thinks.

My cat is immanurable where the dog is.

I'm immanurable about the weather.

Immanure

Another way of saying immature which reinforces your lack of maturity.

Are we there yet?
Oh my god, you are a grown-ass man!
Heh, I'm immanure.