stubbornly or recklessly determined.
going at terrific speed.
in a hellbent manner; with reckless determination; at full speed.

1825–35, Americanism; hell + bent1

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World English Dictionary
hellbent (ˌhɛlˈbɛnt)
adj (and foll by on)
informal strongly or rashly intent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
But if someone seems hellbent on sinking his or her own career, it won't help
  you to join in on the downslide.
Whatever the cause, at this moment we're marching hellbent for fiscal crisis.
The audience ranks among one of the largest in broadcast television-and it is
  hellbent on ferreting out the results.
The station has been taken over by the aliens who are hellbent on keeping the
  team from leaving town.
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