Wood said Musk's "pedo guy" remark was a slur that would overshadow Unsworth's relationships and job prospects for years to come and urged jurors to teach the Tesla chief executive and SpaceX founder a lesson by awarding Unsworth $190 million, including $150 million in punitive damages.
"My faith in humanity has been restored", Musk said after the verdict.
This is not the first time Musk's tweeting has resulted in legal action.
The jury returned its verdict on Friday afternoon after a four-day trial in which Musk testified for six hours.
Mr Musk sent Tesla engineers and a small submarine to help with the Thai rescue effort, but it was never used.
The kids, aged 11 to 16, were saved without the use of the sub. During the rescue, he helped recruit experienced cave divers who were instrumental in freeing the boys safely. Unsworth called Musk's intervention a "PR" stunt and said the high-tech entrepreneur should "stick his submarine where it hurts".
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Vernon Unsworth, who participated in the rescue of 12 boys and their soccer coach trapped for weeks in a Thailand cave past year, had sought $190 million in damages from a man his lawyer called the "billionaire bully". Sus - meaning suspect, or suspicious.
Unsworth, who knew the caves well, ridiculed the high-profile effort from Musk, who is also the CEO of SpaceX.
Unsworth, a financial consultant who divides his time between England and Thailand, described to the jury the effect the tweet had on him.
Asked if there was talk of his being a pedophile at a 10 Downing Street event where he stood next to Theresa May, then Britain's prime minister, Unsworth said: "Not that I recall". I feel humiliated. Ashamed.
It was a tweet heard around the world.
To win his lawsuit, Unsworth needs to show Musk was negligent in publishing a falsehood that clearly identified him and caused him harm.
Appearing dejected, Mr Unsworth himself added: "I respect the jury's decision".
At the trial, Unsworth's lawyers argued that the term "pedo guy" suggested Musk said the diver was a pedophile, but reports from the jury suggest their case wasn't thorough enough to prove the tweet damaging.