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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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
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Example sentences for heedlessness
I undertake the training rule to abstain from drinks and drugs that cause heedlessness.
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