- defective (adj.)
[defective 词源字典]
- mid-14c., from Middle French défectif (14c.) and directly from Late Latin defectivus, from defect-, past participle stem of deficere (see deficient). A euphemism for "mentally ill" from 1898 to c. 1935. Related: Defectively; defectiveness.[defective etymology, defective origin, 英语词源]