mercilessadjective
uk/ˈmɜː.sɪ.ləs/us/ˈmɝː.sɪ.ləs/disapprovingC2 having or showing no mercy:
There are reports of merciless attacks on innocent civilians.
There was no shelter from the merciless (= very strong) heat.
Thesaurus: synonyms and related words
Unkind, cruel & unfeeling
- acerbic
- acidly
- backbite
- backbiting
- backhanded
- barbaric
- bilious
- cruelty
- cutthroat
- fiendish
- hard-hearted
- have a heart of stone idiom
- insensible
- malign
- remorseless
- ruthless
- sadism
- sadist
- savagery
- waspish
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mercilessly
adverb uk/ˈmɜː.sɪ.ləs.li/us/ˈmɝː.sɪ.ləs.li/
Louis was teased mercilessly by his schoolmates.