inertion

CIDE DICTIONARY

inertion, n. 

 Lack of activity or exertion; inertness; quietude.  [1913 Webster]
"These vicissitudes of exertion and inertion of the arterial system constitute the paroxysms of remittent fever."  [1913 Webster]

ROGET THESAURUS

inertion

Physical Inertness

N physical inertness, inertness, dullness, inertia, vis inertiae, inertion, inactivity, torpor, languor, quiescence, latency, inaction, passivity, mental inertness, sloth, inexcitability, irresolution, obstinacy, permanence, rare gas, paraffin, noble metal, unreactivity, inert, inactive, passive, torpid, sluggish, dull, heavy, flat, slack, tame, slow, blunt, unreactive, lifeless, dead, uninfluential, latent, dormant, smoldering, unexerted, inactively, in suspense, in abeyance.