defekt bedeutet auf Englisch

defective▼(having one or more defects)
adjective
[UK: dɪ.ˈfek.tɪv] [US: də.ˈfek.tɪv]

faulty [faultier, faultiest]▼(having or displaying faults; not perfect; not adequate or acceptable)
adjective
[UK: ˈfɔːl.ti] [US: ˈfɒl.ti]

deficient number▼noun

defective▼(having only some forms)
adjective
[UK: dɪ.ˈfek.tɪv] [US: də.ˈfek.tɪv]

immunodeficiency [immunodeficiencies]▼(A depletion in the body's natural immune system)
noun
[UK: ɪ.ˌmjuː.nəʊ.dɪ.ˈfɪʃn.si] [US: ɪ.ˌmjuːno.ʊ.dɪ.ˈfɪʃn.si]

mass defect▼(difference between the mass of an atom and that of its components)
noun
[UK: mæs dɪ.ˈfekt] [US: ˈmæs ˈdiː.fekt]