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Simple terms: The 'reason' that to why you have to use some sort of effort to move or stop something like an object.

The law/principle of inertia states that a body at rest will remain at rest and a body in motion will continue moving with a constant velocity unless acted upon by an external non zero force.

Don't confuse this with momentum
Due to inertia, a moving body in space (ie a vacuum) will not stop or deviate unless another non zero force acts on it (eg gravity)
inertia by White Razor March 29, 2007
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"Man, Jessica had so much inertia the other day, she couldn't even get off the couch!"
inertia by smoking-glove December 20, 2012
inertia is a property of matter
Bill Nye: Inertia is a property of matter
inertia by hecker heck October 20, 2019
Tendency for a person to resist a change in movement; Force needed to generate the momentum to cause movement
"I'm hungry, but have no inertia to get up and go eat"
INERTIA by Supersuperdude September 3, 2011
Boostbuddy line of performance and making your slow car fast
I bought my turbo from Inertia and it's boosts like crazy!!!
The condition where you are lazy to do productive tasks (cleaning the house, looking after a child, doing college assignments) after doomscrolling on your smartphone for hours on end
After three hours of doomscrolling, I was hit with such inertia that I couldn't even muster the energy to wash the dishes!
inertia by Emotional Cruiser September 28, 2025