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1. A lack of attentiveness (as to children or helpless people)
   - inattentiveness
    
2. The trait of acting rashly and without prudence
   - mindlessness, rashness
    
3. The trait of forgetting or ignoring your responsibilities
   - unmindfulness, inadvertence, inadvertency

Derived forms: heedlessnesses

See also: heedless

Type of: attentiveness, imprudence, inattention

Antonym: heedfulness