Definition of defectious in US English:

defectious

adjective

  • Having defects; defective, faulty; imperfect. Now rare.

Origin

Mid 16th century; earliest use found in John Alday (fl. 1566–1579), translator. From classical Latin dēfect-, past participial stem of dēficere defect + -ious, probably after infectious and Middle French defectueux defectuous.

Pronunciation

defectious

/dɪˈfɛkʃəs/