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Possibly 'unmercifully' or 'mercilessly' -- that is -- without pity. Said of something or someone who will continue to attack until death, and if it isn't their own death, even <i>that</i> may not stop them.
Personally, I think the Zombieslayer made more of a typo than a new word, but he hasn't copped to it, so ya never know.
We unmercibly attacked the intruders.

Google said: "Did you mean: unmercifully"?
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