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8 Words That Are Older Than You Think

merciless

[mur-si-lis] /ˈmɜr sɪ lɪs/
adjective
1.
without mercy; having or showing no mercy; pitiless; cruel:
a merciless critic.
Origin
1300-1350
1300-50; Middle English mercyles. See mercy, -less
Related forms
mercilessly, adverb
mercilessness, noun
Synonyms
hard, relentless, unrelenting, fell, unsympathetic, inexorable.
Antonyms
compassionate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mercilessness

merciless

/ˈmɜːsɪlɪs/
adjective
1.
without mercy; pitiless, cruel, or heartless
Derived Forms
mercilessly, adverb
mercilessness, 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
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Word Origin and History for mercilessness

merciless

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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