The phrase "unrestrained growth" means when something grows without any control or limits. It suggests that there are no restrictions or restrictions are not being followed, causing rapid and unchecked expansion. Full definition
The largest economic consequences of unrestrained growth in emissions are related to the impacts of climate change, the costs of which are growing and will be catastrophic for the U.S. and world economies later in the century if emissions are not dramatically reduced. (heatisonline.org)
It has also supported the unrestrained growth of the American stock market,» Grachev told RT.. (geckoresearch.com)
As a result, the game's unrestrained growth has burdened it with rules - flouting coaches and players who are transferring at will (si.com)