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unrestrained

[uhn-ri-streynd]
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adjective
  1. not restrained or controlled; uncontrolled or uncontrollable: the unrestrained birthrate in some countries.
  2. not constrained; spontaneous: unrestrained laughter.

Origin of unrestrained

First recorded in 1580–90; un-1 + restrained
Related formsun·re·strain·ed·ly [uhn-ri-strey-nid-lee] /ˌʌn rɪˈstreɪ nɪd li/, adverbun·re·strain·ed·ness, noun

Synonyms

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1. unchecked, unrepressed, unbridled, excessive.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unrestrained

unrestrained

adjective
  1. not restrained or checked; free or natural
Derived Formsunrestrainedly (ˌʌnrɪˈstreɪnɪdlɪ), adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unrestrained

adj.

1580s, from un- (1) "not" + past participle of restrain.

Online Etymology Dictionary, © 2010 Douglas Harper