mental defectiveness

Từ điển WordNet v3.1 - WordNet Dictionary

noun

retardation sufficient to fall outside the normal range of intelligence
• Syn:
abnormality
• Derivationally related forms:
abnormal (for: abnormality)
• Hypernyms:
retardation, mental retardation, backwardness, slowness, subnormality
• Hyponyms:
feeblemindedness