"Joint ventures are notoriously hard to do," one executive said.

Contemporary art can be notoriously hard to navigate of course.

This is especially important when working with brain tumor models, which are notoriously hard to study.

In any event, brand images are notoriously hard to change, analysts say.

But Masters are notoriously hard to deal with and this one has not had a student in many years.

Casualties in the battle are notoriously hard to calculate exactly.

The value of such options contracts are notoriously hard to pin down.

He is notoriously hard to please and sets himself apart from others by trying to be different.

Data on ticket prices for specific services is notoriously hard to find.

The mathematics that describe the strong force are notoriously hard to solve.