mentally ill; very excited; filled with great enthusiasm
crazy, insane
Cases of word usage
1) (of a person) mad (bonkers)
2) a person with strange or mad ideas (crackpot)
3) wildly excited or mad (crazed)
4) to make (a person) mad (because of worry, grief etc) (derange)
5) a mad person; a person with extreme enthusiasm (maniac)
6) crazy; mad (nuts)
7) behaving as if a little mad (scatty)
8) feeling pleased and thankful; mad (touched)