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English definition of “relentless”

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adjective  /rɪˈlent·ləs/ us  
continuing in a determined way without any interruption: the relentless pursuit of wealth and power
adverb  /rɪˈlent·lə·sli/ us  
He is campaigning relentlessly, trying to build support.
(Definition of relentless from the Cambridge Academic Content Dictionary © Cambridge University Press)
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