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I tried to show a calm exterior but inside my brain was racing.

She kept a calm exterior, though her heart ticked faster again.

He followed Anthony to the hall with calm exterior and shaken interior.

Despite his rude words, the man's calm exterior hadn't changed in any way.

He could feel a great deal of turmoil beneath her calm exterior.

I think it's the subtle way he suggests what's going on under his calm exterior.

Under his calm exterior, Kresh was a mass of doubt.

She must be, he thought, a bit anxious despite her calm exterior.

So you see, beneath that calm exterior lies a highly unstable child.

He was exceedingly nervous, but did his best to put on a calm exterior.