'halting voice' is correct and usable in written English.
You can use it to describe someone speaking in a slow or uncertain manner. For example: "He addressed the crowd in a halting voice, uncertain of how they would receive his message."
"I'm amazed," he said in a raspy, halting voice.
"I refuse to allow that," Susan Bro testified in a strong but sometimes halting voice.
-- not when the narrative included Mr. Van Auken's harrowing, halting voice mail message.
Martyn Poliakoff's voluminous hair, thick glasses and halting voice have made the Nottingham chemist a 'YouTube' sensation.
"I caused it all," Mr. Blagojevich said in a gravelly, halting voice as he stood before the federal judge who was minutes away from deciding his prison term.
Almost as an aside it starkly contrasts the halting voice of the diffident Bertie with the savage bark of Hitler shown in newsreels, and implies that mass communications are leading history into scary unknown territory.
(Anderson) Buffy Sainte-Marie (Tuesday) The leading chanteuse of American Indian activism packs one of the most warbling, deliberately halting voices in all of folk.
"It was embarrassing for a long time to have my daughter on a college job earning the same money as me," he said, his voice halting.
"And every time I look at that painting, I think about Grace, and I think about the life that she lived and the life that lay ahead of her," Obama went on, his voice halting.
"It is difficult for me to explain because I feel that Eliveth has been like a member of my family," she begins in halting Spanish, her voice low and quiet.
LAS VEGAS — Four times, in a halting, broken voice, a humbled O. J. Simpson said Friday, "I'm sorry".
