'defective' originates from Latin, specifically the word 'defectivus,' where 'deficere' meant 'to fail or be lacking.'

'defectivus' transformed into the Old French word 'defectif,' and eventually became the modern English word 'defective' through Middle English.

Initially, it meant 'lacking or failing,' but over time it evolved into its current meaning of 'having a flaw or imperfection.'