inertial

 [in-ur-shuh, ih-nur-]  

in·er·tia

   [in-ur-shuh, ih-nur-]
noun
1.
inertness, especially with regard to effort, motion, action, and the like; inactivity; sluggishness.
2.
Physics.
a.
the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force.
b.
an analogous property of a force: electric inertia.
3.
Medicine/Medical. lack of activity, especially as applied to a uterus during childbirth when its contractions have decreased or stopped.
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Origin:
1705–15; < Latin: lack of skill, slothfulness. See inert, -ia

Related forms
in·er·tial, adjective
non·i·ner·tial, adjective

Synonyms
1. torpor, inaction, laziness.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Inertial is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
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Collins
World English Dictionary
inertia (ɪnˈɜːʃə, -ʃɪə)
 
—n
1.  the state of being inert; disinclination to move or act
2.  physics
 a.  the tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force
 b.  an analogous property of other physical quantities that resist change: thermal inertia
 
in'ertial
 
—adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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