crackbrained vs crackpot

crackbrained

adj

  • Idiotic. 

crackpot

adj

  • Eccentric or impractical. 

noun

  • An eccentric, crazy or foolish person. 

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

How often have the words crackbrained and crackpot occurred in a corpus of books? (source: Google Ngram Viewer )