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inertia

in·er·tia

inertia

pronunciation:
ih nuhr sh
features:
Word Explorer
part of speech: noun
definition 1: the condition of being inert; motionlessness; inactivity.
synonyms:
immobility, inaction, motionlessness
antonyms:
energy
similar words:
idleness, lethargy, stillness, torpor
definition 2: in physics, the tendency of a motionless body to remain still or of a body in motion to continue at a constant velocity along a straight line unless subjected to some external force.
derivation: inertial (adj.)
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  physics