'promiscuous' originates from Latin, specifically the word 'promiscuus,' where 'pro-' meant 'forward' and 'miscere' meant 'to mix.'

'promiscuus' transformed into the Late Latin word 'promiscuus,' and eventually became the modern English word 'promiscuous' through Middle English.

Initially, it meant 'mixed or mingled,' but over time it evolved into its current meaning of 'indiscriminate or casual, especially in sexual relations.'