"Tumultuous change" refers to a period of dramatic and chaotic transformation or upheaval. It describes a situation where there is a lot of turmoil, commotion, or disorder as significant changes occur. Full definition
To pull this off it has developed a host of tricks that have seen it through millions of years of tumultuous change. (newscientist.com)
If he loses there will be tumultuous change beginning with his own resignation. (totalpolitics.com)
Both books are honest, poignant portraits of young women on the brink of tumultuous change, facing the harsh reality of a world that may not be too thrilled with who they are. (booklistonline.com)