mental retardation

Từ điển WordNet v3.1 - WordNet Dictionary

noun

lack of normal development of intellectual capacities
• Syn:
retardation, backwardness, slowness, subnormality
• Derivationally related forms:
subnormal (for: subnormality), slow (for: slowness), backward (for: backwardness), retard (for: retardation)
• Hypernyms:
stupidity
• Hyponyms:
abnormality, mental defectiveness, moronity, mental deficiency, idiocy,
amentia, imbecility