characterized by or involving indiscriminate mingling or association, especially having sexual relations with a number of partners on a casual basis.
consisting of parts, elements, or individuals of different kinds brought together without order.
indiscriminate; without discrimination.
casual; irregular; haphazard.

1595–1605; < Latin prōmiscuus mixed up, equivalent to prō- pro-1 + misc(ēre) to mix + -uus deverbal adj. suffix; see -ous

promiscuously, adverb
promiscuousness, noun
hyperpromiscuous, adjective
hyperpromiscuously, adverb
hyperpromiscuousness, noun
nonpromiscuous, adjective
nonpromiscuously, adverb
nonpromiscuousness, noun
unpromiscuous, adjective
unpromiscuously, adverb
unpromiscuousness, noun

1. unchaste. 2. hodgepodge, confused, mixed, jumbled. See miscellaneous. 3. careless.

1, 2. pure. 3. selective. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
promiscuous (prəˈmɪskjʊəs)
1.  indulging in casual and indiscriminate sexual relationships
2.  consisting of a number of dissimilar parts or elements mingled in a confused or indiscriminate manner
3.  indiscriminate in selection
4.  casual or heedless
[C17: from Latin prōmiscuus indiscriminate, from pro-1 + miscēre to mix]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, "consisting of a disorderly mixture of people or things," from L. promiscuus "mixed, indiscriminate," from pro- "forward" + miscere "to mix" (see mix). Meaning "indiscriminate in sexual relations" first recorded 1900, from promiscuity (1849, "indiscriminate mixture;"
sexual sense 1865), from Fr. promiscuité, from L. promiscuus.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Both chimpanzees and bonobos mate promiscuously and this is why the males have
  large testes.
Everything about the ball culture signifies so blatantly and so promiscuously
  that the movie induces a kind of semiotic daze.
It's possible to demean oneself by sinking to the level of those who
  promiscuously accept any sort of apology.
And this is the benefit which may be had of books promiscuously read.
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