heedlessness

From heedless +‎ -ness.

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heedlessness (usually uncountable, plural heedlessnesses)

1. The state or character of being heedless

   Synonyms: inattention, carelessness, thoughtlessness

• unheed (noun)

• “heedless”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.