Negligence is about insufficient attention or consideration, more than just forgetting. Leaving your phone unlocked may be seen as negligence of privacy.
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Not Always Deliberate
Negligence can occur without intent to harm, contrasting with deliberate irresponsibility. Forgetting to water the plants was an act of negligence, not deliberate harm.
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Common Usage
In everyday language, 'negligence' often implies laziness or a lack of effort. The broken window was a result of the janitor's negligence.