heedless

[heed-lis]
adjective
careless; thoughtless; unmindful: Heedless of the danger, he returned to the burning building to save his dog.

Origin:
1570–80; heed + -less

heedlessly, adverb
heedlessness, noun


oblivious, indifferent; negligent, uncaring, unconcerned.


cautious, mindful, heedful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heedless (ˈhiːdlɪs)
 
adj
taking little or no notice; careless or thoughtless
 
'heedlessly
 
adv
 
'heedlessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They, too, can put our lives at risk by being heedless.
To others, though, his story was the cautionary tale of a heedless fool.
Daring physical feats and heedless accidents shape her choreography.
By contrast, fantasy writers are free to roam, fueled by imagination and
  heedless of the stringent requirements of history.
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