Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

172. Physical Inertness — N. inertness, dullness &c adj.; inertia, vis

inertiae [Lat.], inertion†, inactivity, torpor, languor; quiescence &c 265; latency, inaction; passivity. mental inertness; sloth &c (inactivity) 683; inexcitability &c 826 [Obs.]; irresolution &c 605; obstinacy &c 606; permanence &c 141. rare gas, paraffin, noble metal, unreactivity. V. be inert &c adj.; hang fire, smolder. Adj. inert, inactive, passive; torpid &c 683; sluggish, dull, heavy, flat, slack, tame, slow, blunt; unreactive; lifeless, dead, uninfluential†. latent, dormant, smoldering, unexerted†. Adv. inactively &c adj.; in suspense, in abeyance.