Translation of "Demented" in Japanese

I'm in difficulties because of the demented old woman next door wreaking havoc in my fields.

近所の痴呆のお婆ちゃんが、僕の畑を荒らして困るんです。

- Tom is a loon.
- Tom's crazy.
- Tom's insane.
- Tom's mad.
- Tom is crazy.
- Tom is demented.
- Tom is insane.
- Tom is mad.

- トムはクレイジーだ。
- トムはきちがいだ。