This extension will remove the short description from product on category, bestseller, featured, related products and others.

To adjust the blank space leaved after remove short description, go to file catalog/view/theme/default/stylesheet/stylesheet.css

find:
.product-thumb .caption {
padding: 0 20px;
min-height: 180px;

change to:
.product-thumb .caption {
padding: 0 20px;
min-height: 80px;

Not working yet?
1. Refresh modification: Extensions -> Modifications;
2. Clear the cache from twig: Dashboard - upper right side button - Disable cache and update.