English Reference
adjective · noun

defective

adj. · n.
US /dɪˈfɛktɪv/ UK /dɪfˈɛktɪv/ de·fec·tive UK spelling defectives

  1. 01 B2 Upper Intermediate

    adj.having a fault or a problem that stops something from working correctly.

    adj.having one or more flaws; imperfect in form, structure, or function.

    Simple

    I had to return the toaster because it was defective and wouldn't heat up.

    In context

    The company issued a massive recall after discovering that a defective valve in the engine could lead to sudden power loss.

  2. 02 C1 Advanced TechnicalAcademic Science

    adj.describing a word that does not have all the usual forms, like a verb that has no past tense.

    adj.lacking a full paradigm of inflected forms; for example, a verb that cannot be conjugated in all tenses or persons.

    Simple

    The verb 'must' is defective because it does not have a past tense form.

    In context

    Modal verbs in English are considered defective since they lack infinitive forms and do not take the third-person singular suffix.

    Usage

    In linguistics, this adjective typically modifies nouns like 'verb', 'noun', or 'paradigm'.

  3. 03 C2 Proficiency FormalTechnical

    n.an object that has a flaw or does not work as it should.

    n.a person or thing categorized as having a defect; in modern usage, this often refers to manufactured goods in a quality control context.

    Simple

    The factory worker removed the defectives from the assembly line before they were packed.

    In context

    The inspector was tasked with identifying any defectives in the batch of precision lenses before they were shipped to the laboratory.

  4. 04 C2 Proficiency TechnicalAcademic Science

    adj.describing a way of writing that does not show all the sounds of a language.

    adj.referring to a script or spelling system that lacks the means to represent all phonemic distinctions, such as vowels.

    Simple

    Some ancient scripts used a defective spelling system that didn't include vowels.

    In context

    The scholar noted that the defective orthography of the inscription made it difficult to determine the exact pronunciation of the royal names.

    plene

After Elliott started to raise concerns about defective buildings, he told the inquiry Nassif went “nuts”.

The Guardian· 21 Aug 2026

From Middle English defectif, defective, from Old French defectif, from Late Latin dēfectīvus.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin la-lat dēfectīvus
Level B2 · Upper Intermediate
Frequency Frequent
Updated