"heedlessness" in the noun sense
1. inattentiveness, heedlessness
a lack of attentiveness (as to children or helpless people)
2. heedlessness, mindlessness, rashness
the trait of acting rashly and without prudence
3. unmindfulness, heedlessness, inadvertence, inadvertency
the trait of forgetting or ignoring your responsibilities
Source: WordNet® (An amazing lexical database of English)
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