aposiopetic

/ˌæpəˌsaɪəˈpɛtɪk/
adjective
  1. Relating to or characterized by a sudden break in speech, leaving a sentence unfinished.
    • Her aposiopetic remark, 'I just think... oh, forget it,' frustrated her listeners.
    • His aposiopetic style of speaking made his dialogues feel tense and dramatic.
    • The writer used an aposiopetic dash to show the character's hesitation.
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