heed·less

[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

heed·less·ly, adverb
heed·less·ness, noun


oblivious, indifferent; negligent, uncaring, unconcerned.


cautious, mindful, heedful.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
heedless (ˈhiːdlɪs) [Click for IPA pronunciation guide]
 
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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00:10
Heedless is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
Example sentences
Remain heedless, and the failing cities will wreck everything else.
The findings of the study challenge pre-existing stereotypes of universally
  heedless, exploitative, and irresponsible behavior.
The immense resources of the country are wasted, and its splendid capabilities
  neglected with heedless recklessness.
What one desperately wants to understand are the motivations that prompt such
  heedless behavior.
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