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merciless

adjective
     
mer‧ci‧less
1 cruel and showing no kindness or forgiveness:
a merciless attack
a merciless killer
2

merciless heat/cold/wind etc

heat, cold etc that is very great or strong and unpleasant, and does not stop:
It brings some relief from the merciless summer heat.
mercilessly adverb:
He teased his sister mercilessly.

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