1.   His voice did not betray the slightly perturbed current of his thoughts.

2.   His words were calm, but his voice betrayed his very real concern and anxiety.

3.   His voice betrayed his nervousness.

4.   Did our voices betray our wishful thinking?

5.   His voice betrayed what he felt at the prospect of watching from so far away.

6.   His voice betrayed a touch of weariness.

7.   Unless the person is a pathological liar, Mauro said, the voice should betray some extra stress or excitement when lying.

8.   With a catch in his voice betraying his own pain and loneliness, he reached into their souls, stoking their vulnerabilities.

9.   Bartlet replies, his voice betraying a hint of irritation.