Verb
falter
IPA /ˈfɔːltə(r)/
To become weaker, less confident or less effective.
See example sentence: falter
Her confidence faltered after several unsuccessful driving lessons.
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Verb
vacillate
IPA /ˈvæsəleɪt/
To keep changing your mind instead of making a firm decision.
See example sentence: vacillate
I vacillated between the blue curtains and the green ones all afternoon.
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