What is another word for high impact?
Pronunciation: [hˈa͡ɪ ˈɪmpakt] (IPA) 
High impact is a phrase that refers to something that has a significant influence or effect on a particular situation. There are several synonyms that can be used to describe something that has a high impact. Some of these synonyms include potent, powerful, influential, forceful, dynamic, robust, compelling, and forceful. These words describe something that is capable of producing a strong and lasting effect on its recipient. Each of these synonyms carries a slightly different connotation, but they all imply the ability to make a profound difference. When looking for a word to describe something with a powerful effect, using one of these synonyms would be a great place to start.
