|1.||having a defect or flaw; imperfect; faulty|
|2.||(of a person) below the usual standard or level, esp in intelligence|
|3.||grammar (of a word) lacking the full range of inflections characteristic of its form class, as for example must, which has no past tense|
defective de·fec·tive (dĭ-fěk'tĭv)
Having an imperfection or malformation.
Lacking or deficient in some physical or mental function.