crack·pot \ˈ ̷ ̷ˌ ̷ ̷\noun Usage:often attributive Etymology:crack (I) + pot “head” : one given to erratic, impractical, or lunatic ideas or notions < a new crop of crackpots determined to lead the country into chaos — Bill Mauldin > < crackpot ideas > • crack·pot·ism\“+ˌizəm\noun-s