(n.) The quality or state of being incommutable.

abidingness age antiquity application assiduity assiduousness bulldog tenacity ceaselessness changelessness coeternity concentration constancy continualness continuance defeat of time defiance of time dependability diligence diuturnity dogged perseverance doggedness durability durableness duration endlessness endurance engrossment eternalness eternity ever-duringness everlastingness everness fidelity fixedness foreverness immutability incessancy incommutability indefatigability indefeasibility indestructibility industriousness industry inertness infinite duration infinity insistence insistency interminability intransmutability irretrievability irreversibility irrevocability lastingness long standing long-lastingness long-livedness longevity loyalty maintenance never-endingness obstinacy patience patience of Job perdurability perennation perenniality perennialness permanency perpetualness perpetuity perseverance persistence persistency pertinaciousness pertinacity plodding plugging preoccupation relentlessness reliability resolution sedulity sedulousness sempiternity single-mindedness singleness of purpose slogging stability stamina standing staying power steadfastness steadiness stick-to-itiveness stubbornness survival survivance tenaciousness tenacity timelessness tirelessness unalterability unceasingness unchangeability unchangeableness unmodifiability unremittingness unrestorableness unreturnableness unswerving attention