carelessness
ca·re·less·ness
noun
2.
failure to act with the prudence that a reasonable person would exercise under the same circumstances
Origin
From Middle English *carelesnes, *carlesnesse, from Old English carlēasnes (“freedom from care, security, carelessness”), equivalent to careless + -ness.
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Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.