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Webster 1828 Edition

adv.

In a manner void of mercy or pity; cruelly.

mercilessly ‎(comparative more mercilessly, superlative most mercilessly)

In a merciless manner.
She mercilessly read off the list of his wrongs in front of their friends.

in a merciless manner

Spanish: despiadadamente
Turkish: acımasızca (tr), acımasızcasına, zalimce (tr), zalimcesine, zalimane (tr)