addle
ad·dle
/ˈædl̩/ verb , ad·dles, ad·dled, ad·dling [ + obj ]
: to make (someone's mind or brain) unable to think clearly
It's a dangerous poison that's strong enough to addle the brain.
Their brains were addled with/by fear/drugs.
addled adj
I needed a moment to clear my addled [=confused] brain/mind.
an addled old man
