Meaning of “merciless” in the English Dictionary

"merciless" in British English

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uk /ˈmɜː.sɪ.ləs/ us /ˈmɝː.sɪ.ləs/ 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.
adverb uk /ˈmɜː.sɪ.lə us /ˈmɝː.sɪ.lə

Louis was teased mercilessly by his schoolmates.

(Definition of “merciless” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"merciless" in American English

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us /ˈmɜr·sɪ·ləs/

showing no kindness; cruel:

a merciless enemy
adverb us /ˈmɜr·sɪ·ləs·li/

He was teased mercilessly at school.

(Definition of “merciless” from the Cambridge Academic Content Dictionary © Cambridge University Press)