immoderate; not restrained or held in check (adjective)
spontaneous, natural and informal; unconstrained (adjective)
Examples of word unrestrained
The joint Guardian-LSE Reading the Riots project has shown that the interpretation of the riots as an expression of unrestrained greed and lawlessness is only a partial account.
What makes him somewhat leftist is that he locates the evil in unrestrained and unbridled capitalism (he even makes a stab at free market economists having blood on their hands).
In the sixties and seventies, Toronto had a booming and free -- as in unrestrained -- rental market.
(London, Intermediate Technology Development Group) 1982, Vol. 8, No. 4, pp. (13) Smith, R.G.: Long-term unrestrained expansion of test bricks in Transactions of the British Ceramic Society (London), 1973,
United States to head off the Socialistic program, which, unrestrained, is sure to wreck our country.