screwball /ˈskɹuːbɔːl/noun 3adjective 1forms 3 noun3 •A pitch thrown with added pressure by the index finger and a twisting wrist motion resulting in a motion to the right when thrown by a right-handed pitcher.The screwball is not thrown much because it tends to damage pitcher's arms. •(informal, disapproving) One who behaves in a crazy manner.I will not listen to this screwball any longer. •A screwball comedy. adjective1 •(informal) Crazy, offbeat, bizarre, zany, or weird.Also a big hand for Silver Linings Playbook, an exuberant modern screwball comedy we had, in an unseemly fit of cynicism, deemed "too entertaining" for Academy voters. — 2013 formsscrewballs · more screwball · most screwball