The science officer was trying to hide his frustration, though he wasn't doing a very good job of it.

Then came yesterday, and there was no hiding his frustration.

"I'm well aware of the circumstances," Zhenya said with a small smile to hide his frustration.

Students are not reluctant to hide their frustration and impatience.

Some company officials do not hide their frustration with rising health care costs.

Wesley asked, making no attempt to hide his angry frustration, though it was still tempered by fear.

With Yacov, there was no need to hide her frustration and disappointment.

He does not hide his frustration with the tenants.

Some mayors have smiled through a term or two to hide their frustration.

I had a hard time hiding my frustration.