without mercy; having or showing no mercy; pitiless; cruel: a merciless critic.

Origin of merciless

First recorded in 1300–50, merciless is from the Middle English word mercyles. See mercy, -less
Related formsmer·ci·less·ly, adverbmer·ci·less·ness, noun

Synonyms for merciless

Antonyms for merciless Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mercilessly

Contemporary Examples of mercilessly

Historical Examples of mercilessly

British Dictionary definitions for mercilessly



without mercy; pitiless, cruel, or heartless
Derived Formsmercilessly, adverbmercilessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mercilessly



late 14c., see mercy + -less. Related: Mercilessly.

Online Etymology Dictionary, © 2010 Douglas Harper