adj. 1 a (of a person) having frequent and diverse sexual relationships, esp. transient ones. b (of sexual relationships) of this kind. 2 of mixed and indiscriminate composition or kinds; indiscriminate (promiscuous hospitality). 3 colloq. carelessly irregular; casual. promiscuity n. promiscuously adv. promiscuousness n.
[ L promiscuus (as PRO-(1), miscere mix) ]