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English definition of “merciless”

merciless

adjective  /ˈmɜr·sɪ·ləs/ us  
showing no kindness; cruel: a merciless enemy
mercilessly
adverb  /ˈmɜr·sɪ·ləs·li/ us  
He was teased mercilessly at school.
(Definition of merciless from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of merciless?
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