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[in-urt, ih-nurt] /ɪnˈɜrt, ɪˈnɜrt/

having no inherent power of action, motion, or resistance (opposed to ):
inert matter.
Chemistry. having little or no ability to react, as nitrogen that occurs uncombined in the atmosphere.
Pharmacology. having no pharmacological action, as the excipient of a pill.
inactive or sluggish by habit or nature.
having no inherent ability to move or to resist motion
inactive, lazy, or sluggish
having only a limited ability to react chemically; unreactive

1640s, from French inerte (16c.) or directly from Latin inertem (nominative iners) “unskilled, inactive, helpless, sluggish, worthless,” from in- “without” + ars (genitive artis) “skill” (see art (n.)). Originally of matter; specifically of gases from 1885. Of persons or creatures, from 1774.

inert in·ert (ĭn-ûrt’)

Not chemically reactive.


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  • Inertance

    [in-ur-tns, ih-nur-] /ɪnˈɜr tns, ɪˈnɜr-/ noun, Acoustics. 1. the effect of inertia in an acoustic system, an impeding of the transmission of sound through the system.

  • Inert-gas

    noun, Chemistry. 1. . noun 1. Also called noble gas, rare gas, argonon. any of the unreactive gaseous elements helium, neon, argon, krypton, xenon, and radon 2. (loosely) any gas, such as carbon dioxide, that is nonoxidizing inert gas n. See noble gas. inert gas See noble gas.

  • Inertia

    [in-ur-shuh, ih-nur-] /ɪnˈɜr ʃə, ɪˈnɜr-/ noun 1. inertness, especially with regard to effort, motion, action, and the like; inactivity; sluggishness. 2. Physics. 3. Medicine/Medical. lack of activity, especially as applied to a uterus during childbirth when its contractions have decreased or stopped. /ɪnˈɜːʃə; -ʃɪə/ noun 1. the state of being inert; disinclination to move or […]

  • Inertia force

    noun 1. an imaginary force supposed to act upon an accelerated body, equal in magnitude and opposite in direction to the resultant of the real forces

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