careless; thoughtless; unmindful: Heedless of the danger, he returned to the burning building to save his dog.

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)
taking little or no notice; careless or thoughtless

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Second, the difficulty of criticizing a discourse that glides heedlessly from one kind of claim to another.
Many readers have castigated me for heedlessly engaging so volatile a subject without due regard for the sensitivities affected.
But he heedlessly commits a cruel injustice by also taking money from the charitable group.
Drives carelessly and heedlessly in willful or wanton disregard of the rights or safety of others.
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