Even when his voice wavers into the self-referential, the assurance of his tone inclines the reader to trust him.
The Times Literary Supplement
At this point her face cracks a little and her voice wavers.
Times, Sunday Times
His voice wavers with emotion.
Times, Sunday Times
For once her voice wavers slightly.
Times, Sunday Times
Her voice wavers and breaks, tears stream down her cheeks.
Times, Sunday Times