Meaning of unmerciful

un•mer•ci•ful

Pronunciation: (un-mûr'si-ful), [key]
— adj.
  1. merciless; relentless; severe; cruel; pitiless.
  2. unsparingly great, extreme, or excessive, as amounts: to talk for an unmerciful length of time.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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