Third-person singular simple present indicative form of inert

Lack of activity or exertion; inertness; quietude.

(physics) A measure of the inertia to flow of a fluid

plural of inertance

The use of an inert gas to prevent explosion

(chemistry) A gas which does not undergo chemical reactions. / (chemistry, specifically) A noble gas.

plural of inert gas

Having arisen as the result of a sociopolitical struggle, but no longer responsive to the needs it was intended to serve.

Nitrogen narcosis.