Heat.
An intense, heated emotion; passion, ardor.
A passionate enthusiasm for some cause.
Habitual lack of care.
The act of neglecting.
The state of being neglected.
To fail to do or carry out something due to oversight or carelessness.
To fail to care for or attend to something.
To omit to notice; to forbear to treat with attention or respect; to slight.
To ignore for the sake of simplifying calculations without significantly affecting accuracy.