crackpot

noun

(informal) An eccentric, crazy or foolish person. / (informal) Someone addicted to crack cocaine (i.e. a drug addict).

He is often regarded as a crackpot due to his unconventional ideas.

意味（1）

(informal) An eccentric, crazy or foolish person.

Time will tell whether he is a crackpot or a genius for promoting that sort of idea.

意味（2）

(informal) Someone addicted to crack cocaine (i.e. a drug addict).