crackpot /ˈkɹæk.pɒt/noun 2adjective 1forms 3 noun2 •(informal) An eccentric, crazy or foolish person.Time will tell whether he is a crackpot or a genius for promoting that sort of idea. •(informal) Someone addicted to crack cocaine (i.e. a drug addict). adjective1 •(informal) Eccentric or impractical. formscrackpots · more crackpot · most crackpot