/ prəˈmɪskjuəs; NAmE / adjective ( disapproving )
1.
having many sexual partners :
promiscuous behaviour
a promiscuous lifestyle
to be sexually promiscuous
2.
( formal ) taken from a wide range of sources, especially without careful thought :
promiscuous reading
a stylistically promiscuous piece of music
► prom·is·cu·ity / ˌprɒmɪsˈkjuːəti; NAmE ˌprɑːməs-/ noun [ U ]:
sexual promiscuity
► prom·is·cu·ous·ly adverb
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WORD ORIGIN
early 17th cent.: from Latin promiscuus indiscriminate, (based on miscere to mix) + -ous . The early sense was consisting of elements mixed together , giving rise to indiscriminate and undiscriminating , which led to the notion of casual .