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unmerciful

[uhn-mur-si-fuh l] /ʌnˈmɜr sɪ fəl/
adjective
1.
merciless; relentless; severe; cruel; pitiless.
2.
unsparingly great, extreme, or excessive, as amounts:
to talk for an unmerciful length of time.
Origin of unmerciful
1475-1485
1475-85; un-1 + merciful
Related forms
unmercifully, adverb
unmercifulness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for unmerciful

unmerciful

/ʌnˈmɜːsɪfʊl/
adjective
1.
showing no mercy; relentless
2.
extreme or excessive
Derived Forms
unmercifully, adverb
unmercifulness, 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 unmerciful
adj.

late 15c., from un- (1) "not" + merciful. Related: Unmercifully.

Online Etymology Dictionary, © 2010 Douglas Harper
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