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de·fec·tive di-'fek-tiv adj falling below the norm in structure or in mental or physical function <\defective eyesight>
de·fec·tive·ness -nəs n
defective n one that is subnormal physically or mentally
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de·fec·tive (de-fekґtiv) faulty; deficient; marked by subnormal function, structure, or behavior.Medical dictionary. 2011.