(n.) The quality of being urgent or pressing\; the act of dwelling upon as of special importance; persistence; urgency.

abetment application assiduity assiduousness bulldog tenacity concentration constancy demandingness diligence dogged perseverance doggedness encouragement endurance engrossment exigency fidelity goading importunacy importunateness importunity indefatigability industriousness industry insistency instance loyalty needling obstinacy patience patience of Job permanence perseverance persistence persistency pertinaciousness pertinacity plodding plugging preoccupation pressing pressingness pressure pricking prodding relentlessness resolution sedulity sedulousness single-mindedness singleness of purpose slogging spurring stability stamina staying power steadfastness steadiness stick-to-itiveness stubbornness tenaciousness tenacity tirelessness unremittingness unswerving attention urgency urging