She dared not trust her voice to say a single word.

It was a moment before she could trust her voice.

She only nodded, far too afraid to trust her voice to speak.

After a moment, he nodded, not quite trusting his voice.

He was definitely trembling inside and could not trust his voice.

At that moment, he didn't trust his voice with anything over two syllables.

It was best not to trust his voice for a few minutes.

"She gave me the push I needed to trust my own voice," he added.

He nodded, not trusting his voice just then to speak.

There was no answer to make, and she didn't trust her voice in any case.