1. 逊常态：subnormal temperature 正常下温度 | subnormality 逊常态 | subnutrition 营养不足
2. 低于正常状态：牐燬ubnormal: 低于正常的 | 牐燬ubnormality:低于正常状态 | 牐燬upernormal:超出正常状态
3. 低能：自杀企图suicidal attempt | 低能subnormality | 副作用side effect
noun
1. lack of normal development of intellectual capacities
Synonym: retardation mental retardation backwardness slowness
2. the state of being less than normal (especially with respect to intelligence)