1. in a way that shows doubt or lack of confidence
2. in a way that is not known or definite

Examples

• She looked around uncertainly, not sure which direction to go.
• He answered the question uncertainly, lacking confidence in his response.
• The weather forecast predicted rain, but only uncertainly.
• The child stepped uncertainly onto the ice for the first time.
• The stock market moved uncertainly throughout the day.
• She smiled uncertainly when meeting her new classmates.