Simple past tense and past participle of deadlock.(verb)
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Use "deadlocked" in a sentence
"By funding right-wing think tanks and ensuring that they have dominance over the Republican Party, Lukoil (and by extension, Russia) can ensure that the Senate will remain deadlocked on crucial climate change legislation, thus preventing the United States from taking a leadership role in stopping climate change."
"But after 11 years, negotiations remain deadlocked over two words."
"If these two candidates are deadlocked, which is what your poll is showing at 47-47 and there's 5 percent undecided."