Etymology
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unrestrained (adj.)

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

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Definitions of unrestrained

unrestrained (adj.)
not subject to restraint;
unrestrained laughter
unrestrained (adj.)
marked by uncontrolled excitement or emotion;
Synonyms: delirious / excited / frantic / mad
From wordnet.princeton.edu