- defective, faulty - having a defect; "I returned the appliance because it was defective"
Antonym: perfect (indirect, via imperfect)
- defective - markedly subnormal in structure or function or intelligence or behavior; "defective speech"
Antonym: normal (indirect, via abnormal)
- bad, defective - not working properly; "a bad telephone connection"; "a defective appliance"
Antonym: functioning (indirect, via malfunctioning)