1. A poor ability to understand or to profit from experience
   "His feeblemindedness when it came to technology was frustrating";
   - stupidity, daftness [informal]
    
2. [archaic] Severe mental deficiency
   "The outdated term 'feeblemindedness' is no longer used in modern psychology"

Type of: abnormality, inability, mental defectiveness

Encyclopedia: Feeblemindedness