Synonyms of 'stammer'
stutterDictionary, falter, splutter
She stammered her way through an introduction.
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If your voice falters when you are speaking, you hesitate or pause, because you are unsure about what you are saying or are upset.
Her voice faltered and she had to stop a moment to control it.
Thesaurus for stammer from the Collins English Thesaurus
If you stammer , you speak with difficulty , hesitating and repeating words or sounds.