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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
Related Words
ignert • Ignertia • Inertia • ignent • Ignernt • ignortion • inert • ignart • ignet • Igneri

Homework Inertia 

The amount of effort it takes to get started on your homework.
Jim has a lot of Homework Inertia, he took until 11:00 PM to care about getting started on it.
Homework Inertia by andy2stacks September 22, 2012

Melodic Inertia 

noun.
The undeniable force from music causing movement in humans.
1. Everyone ran to the artist Fake ID's concert to feel the melodic inertia.
2. The melodic inertia was in the room tonight!
Melodic Inertia by MrMelodicInertia November 30, 2022
1. A southern mispronunciation of ignorant.

2. Meaning extremly stupid in southren terms.
1. You ignent fool!

2. Yall so ignent, you make my pig bessie look smart!
ignent by Stephanie & Zoe Embler February 26, 2007

inertiatic 

Taken from The Mars Volta album "De-Loused From The Comatorium" and linked to the word Inertia (the feeling of not being able to do anything, like there's no will to do anything). Possibly the way you are feeling at the time.
"Dude.. I dunno.. I've just been feeling really inertiatic lately.. Like, I won't even get up in the morning.."
inertiatic by ceilingofmyhead July 26, 2005
Another way of saying that a person is ignorant.
"man that fool is ignet when it comes to women"
ignet by george December 11, 2003
More from Urban Dictionary

Frothability 

The measure of an emotional and over zealous consumer in an upwardly charging market, also known as a bull market. It's characterized by rising asset prices, increased investor confidence, and favorable growth in the markets, bro.
The frothability was evident as over-zealous consumers eagerly engaged in bidding wars, driving property prices to unsustainable levels reminiscent of previous speculative bubbles.
Frothability by cptn.kagaroo1 January 26, 2024
Word of the Day on November 12, 2026

Soul digger

A man who dates women with the sole purpose of exploiting their time, energy, and labor while he sucks the joy and happiness from their lives.
"That guy's a soul digger. He'll expect you to work full time, but you'll be doing all the cooking, cleaning, laundry, shopping, and childcare while he plays video games or watches TV."
Soul digger by anonymous November 11, 2026
Word of the Day on November 11, 2026

pod person 

A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.
pod person by Christopher M. May 9, 2005
Word of the Day on November 10, 2026
A dead drop is a location used to secretly pass items between two people, without requiring them to meet.

Spies have been known to use dead drops, using various techniques to hide the items and to signal that the drop has been made. Drug dealers use this as well.

A common place is to duct tape the item to the underside of a toilet cover in a public restroom.

A signal is sometimes used as well to indicate there is something to pickup, like a pile of stones in a certain formation. After checking the drop the signal is removed.
"The dead drop is the restroom toilet at the Gulf station at the corner of Commercial Ave. and Georges Rd."
dead drop by rubberroom July 23, 2008
Word of the Day on November 9, 2026

No Surprises Wedding

A "No Surprises Wedding," or NSW, is a wedding invitation designation that tells attendees that there can be no unplanned announcements, engagements, events or speeches at the wedding - all actions must be pre-approved by the couple. Anyone who performs an unapproved "surprise" will be asked to leave the wedding early.

This designation comes from Reddit, where so many stories of bad wedding behavior indicated a need to communicate expectations for the wedding behavior of attendees.
You are cordially invited to the nuptials of Brian and Tom on October 31 at noon.

Please note that this wedding is child-free (under 10) and a No Surprises Wedding (NSW). Reach out to wedding planner Sami Smith to request approvals or exceptions; please note that exceptions will be rare. Limited child care for under-10s will be available. All approvals will be noted and included in planning. Unapproved, or surprise exceptions, will result in guests being asked to leave.
Word of the Day on November 8, 2026
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"
ulzzang by `r i k kit t y February 26, 2008
Word of the Day on November 7, 2026
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