sub·nor·mal /-ˈnɔrməl/
  (a.)正常以下的,普通以下的,低能的
  sub·nor·mal /ˌsəbˈnɔrməl/ 形容詞
  低常的,正常下的
  Sub·nor·mal n. Geom. That part of the axis of a curved line which is intercepted between the ordinate and the normal.
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  subnormal
       adj : below normal or average; "after the floods the harvests were
             subnormal"; "subnormal intelligence"
       n : a person of less than normal intelligence