show one's disapproval
express one's disapproval

The evidence thus shows strong social disapproval of open marriage.

His brothers had shown their disapproval of him ever since he first went away to school.

A few studies have shown more direct disapproval of open marriage.

Will said nothing, to show disapproval that a journalist would question him in his own home.

There are more ways of showing disapproval than by speaking your mind.

So, how can our enemies show their disapproval and anger?

Now, suddenly, he understood why the guard had shown disapproval.

The poll also showed continued strong disapproval for Congress's involvement in the case.

Some students and faculty at the lecture showed strong disapproval of the act.