crackpot
noun
°An eccentric, crazy or foolish person. A kook.
"Time will tell whether he is a crackpot or a genius for promoting that sort of idea."
°Someone addicted to crack cocaine (i.e. a drug addict). See also crackhead.
adjective
°Eccentric or impractical.
synonyms: crazy, kook, live one, nut ball more» , nutbag, nutbar, nutcase, nutter