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Webster 1828 Edition

adv.

With hesitation; with a trembling, broken voice; with difficulty or feebleness.

falteringly ‎(comparative more falteringly, superlative most falteringly)

In a faltering manner
hesitantly, making pauses
- 1826, Mary Shelley, The Last Man, part 1, ch. 4
  She spoke falteringly, and concluded with a heavy sigh.