having a defect or flaw; imperfect; faulty (of a person) below the usual standard or level, esp in intelligence (of a word) lacking the full range of inflections characteristic of its form class, as for example must, which has no past tense
WordReference Random House Learner's Dictionary of American English © 2025
de•fec•tive /dɪˈfɛktɪv/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- faulty;
imperfect;
not working properly or effectively:One of the tires was defective.
de•fec•tive
(di fek′tiv),USA pronunciation adj.
n.
de•fec′tive•ly, adv.
de•fec′tive•ness, n.
- having a defect or flaw;
faulty;
imperfect:a defective machine. - Psychologycharacterized by subnormal intelligence or behavior.
- Grammar(of an inflected word or its inflection) lacking one or more of the inflected forms proper to most words of the same class in the language, as English must, which occurs only in the present tense.
n.
- a defective person or thing.
- Late Latin, as above
- Middle French
- Late Latin dēfectīvus, equivalent. to dēfectus (see defect) + -īvus -ive; replacing Middle English defectif
- 1375–1425
de•fec′tive•ness, n.
- 1.See corresponding entry in Unabridged incomplete, deficient.
- 1.See corresponding entry in Unabridged perfect, complete.
Collins Concise English Dictionary © HarperCollins Publishers::
'defective' also found in these entries (note: many are not synonyms or translations):
Jewish calendar
- achondroplasia
- amiss
- aplasia
- astigmatism
- asynergy
- atrophy
- bad
- badly
- barebelly
- belly-land
- bill of goods
- bioengineering
- blister
- call in
- cancel
- carrier
- cobbler
- complete
- confute
- crack
- cretin
- cystic fibrosis
- def
- defective number
- defective year
- deficient
- deficient number
- destructor
- dysautonomia
- dysergia
- dysgenesis
- elliptical
- entire
- examination
- eyeglass
- fag
- faulty
- flaw
- gene therapy
- glass
- halt
- hickey
- homologate
- idiot savant
- imperfect
- inadequate
- incapable
- lame
- lemon