Idle Speculation

"Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion. (…) Inertia comes from the Latin word, iners, meaning idle, or lazy." 

Thinking of this brought another word to mind, and I wondered about its possible correlation to the concept of negligence, not only in its legal definition but also in its broader application in social life.