Here are a few options for phrasing "in a wavering manner" in seven words or less, each with a slightly different nuance:
- Uncertainly, hesitantly, and with doubt.
- With hesitant, uncertain steps.
- In a shaky, unsteady fashion.
- Unsteadily, like a flickering flame.
- Timidly, with wavering confidence.
The best option will depend on the specific context.
