Wanting in something; incomplete; lacking a part; deficient; imperfect; faulty; -- applied either to natural or moral qualities; as, a defective limb; defective timber; a defective copy or account; a defective character; defective rules.
- Having a defect; faulty: a defective appliance.
- Marked by subnormal structure, function, intelligence, or behavior: defective speech.
- Grammar Lacking one or more of the inflected forms normal for a particular category of word, as the verb may in English.
- Offensive One who is physically or mentally deficient.