Definition of mercilessly adverb from the Oxford Advanced Learner's Dictionary

 

mercilessly

 adverb
adverb
BrE BrE//ˈmɜːsɪləsli//
 
; NAmE NAmE//ˈmɜːrsɪləsli//
 
 
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in a way that shows no kindness or pity synonym cruelly (1) His friends teased him mercilessly when they found the poem. see also mercy