Webster's English Dictionary

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defective

1. de.fec.tive \di-'fek-tiv\ aj 1: wanting in something essential : FAULTY  
   2: lacking one or more of the usual forms of grammatical inflection {a (R@ 
   verb} 3: markedly subnormal mentally or physically  - de.fec.tive.ly av
2. defective n : a person who is subnormal physically or mentally