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English definition of “merciless”

merciless

adjective uk   /ˈmɜː.sɪ.ləs/ us    /ˈmɝː-/ disapproving
C2 having or showing no mercy: There are reports of merciless attacks on innocent civilians. There was no shelter from the merciless (= very strong) heat.
mercilessly
adverb uk   /-li/ us  
Louis was teased mercilessly by his schoolmates.
(Definition of merciless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of merciless?
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