pertinacity (n.)

• application
• assiduity
• assiduousness
• balkiness
• bigotry
• bullheadedness
• concentration
• constancy
• determination
• diligence
• doggedness
• dogmatism
• endurance
• engrossment
• exigency
• fanaticism
• fidelity
• fortitude
• gameness
• gaminess
• hardihood
• hardiness
• importunity
• indefatigability
• industriousness
• industry
• insistence
• insistency
• intolerance
• loyalty
• mettlesomeness
• mulishness
• obduracy
• obstinacy
• patience
• permanence
• perseverance
• persistence
• persistency
• pigheadedness
• plodding
• pluckiness
• preoccupation
• pressure
• relentlessness
• resoluteness
• resolution
• restiveness
• sedulity
• sedulousness
• self-will
• single-mindedness
• stability
• stamina
• steadfastness
• steadiness
• stubbornness
• sulkiness
• sullenness
• tenaciousness
• tenacity
• tirelessness
• urgency
• willfulness