Synonyms for “dotty”

adjective

1. (slang mainly British)=  crazy, touched, peculiar, eccentric, batty (slang), off-the-wall (slang), potty (British, informal), oddball (informal), loopy (informal), crackpot (informal), out to lunch (informal), out there (slang), outré, doolally (slang), off your trolley (slang), up the pole (informal), wacko or whacko (slang), off the air (Australian, slang), porangi (New Zealand), daggy (Australian & New Zealand, informal) • She was obviously going a bit dotty.

   See dotty about something

   1. =  keen on, fond of, mad about (informal), crazy about (informal), daft about (informal)