Hi
Are these sentences fully natural?
She kept vacillating between hope and despair.
She kept wavering between hope and despair.
Thanks,
Tom
com/dictionary/falter mean to show irresolution or uncertainty. com/dictionary/hesitate implies a pause before deciding or acting or choosing. com/dictionary/waver implies hesitation after seeming to decide and so connotes weakness or a retreat.
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https://www.merriam-webster.com/dictionary/hesitate, https://www.merriam-webster.com/dictionary/waver,