carelessness is when you dont care about something or someone
but neglect is when you forget or dont take care of something or
someone
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The opposite of neglect (noun) would be care or concern.
The opposite of the verb neglect (meaning ignore) is similarly
to care, to deal with, or to address.
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One example of neglect is when you are not taking care of
someone such as your children or parents. You can also neglect your
job, by not doing a good job.