Down here, the light and the irregular landscape make it especially challenging.

All of these factors made liquidity risk management especially challenging during this time.

But writing thrillers is especially challenging these days, he said.

Diversity within a proposed community can make it especially challenging to complete forming the community.

Finding employment can be especially challenging for those in mid-transition.

For them anything is artistically possible, especially challenging the convention-bound toy industry.

It's especially challenging to get an action-oriented mayor to take this approach.

More serious health problems (acute appendicitis) can be especially challenging to deal with given the limited medical diagnosis and treatment options in space.

And none are especially challenging for anyone beyond an advanced-beginner level.

Some aspects of conducting remain especially challenging for women, however.