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inert (adj.)

1640s, "without inherent force, having no power to act or respond," from French inerte (16c.) or directly from Latin inertem (nominative iners) "unskilled, incompetent; inactive, helpless, weak, sluggish; worthless," used of stagnant fluids, uncultivated pastures, expressionless eyes. It is a compound of in- "without, not, opposite of" (see in- (1)) + ars (genitive artis) "skill" (see art (n.)). In chemistry, "having no active properties, neutral" (1800), specifically from 1885 of certain chemically inactive, colorless, odorless gases. Of persons or creatures, "indisposed or unable to move or act," from 1774.

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Definitions of inert from WordNet

inert (adj.)
unable to move or resist motion;
inert (adj.)
having only a limited ability to react chemically; chemically inactive;
inert matter
Synonyms: indifferent / neutral
inert (adj.)
slow and apathetic;
she was fat and inert
Synonyms: sluggish / soggy / torpid
From wordnet.princeton.edu