in-, not, non, -ert, 器用さ, 技能, 技術, 語源はart, artisanと同じ.
英語の語源
inert
inert: [17] The -ert of inert is the same word as art. The word comes from Latin iners, which originally meant ‘unskilled’, but soon developed semantically to ‘inactive’. It was formed with the negative prefix in- from ars ‘skill’, source of English art. The derivative inertia [18] is a Latin formation. In classical times it meant simply ‘lack of skill, idleness’; it was Johannes Kepler who first used it as a technical term in physics in the 17th century. => art, inertia
inert (adj.)
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.
例文
1. The novel itself remains oddly inert .
小説自体が異常に平板で、無気力になった。
2.He lay inert with half-closed eyes.
彼は目を半分開けたままじっと横になっていた。
3.I carried her，still inert ，up the stairs to my room.
彼女はまだじっとしていて、私は彼女を上の階の私の部屋に抱いて行った。
4.He lay completely inert on the floor.
彼は床にじっと横たわっている。
5. Inert gas studies are providing valuable information about other plants，too.