assiduity (n.)

• advertence
• advertency
• alertness
• application
• ardor
• assiduousness
• attention
• attentiveness
• awareness
• care
• concentration
• consciousness
• consideration
• constancy
• diligence
• doggedness
• ear
• earnestness
• endurance
• energy
• engrossment
• fervor
• fidelity
• heed
• heedfulness
• indefatigability
• industriousness
• industry
• insistence
• insistency
• intentness
• laboriousness
• loyalty
• mindfulness
• note
• notice
• observance
• observation
• obstinacy
• pains
• painstakingness
• patience
• permanence
• perseverance
• persistence
• persistency
• pertinacity
• plodding
• preoccupation
• regard
• relentlessness
• remark
• resolution
• respect
• sedulity
• sedulousness
• single-mindedness
• stability
• stamina
• steadfastness
• steadiness
• strenuousness
• stubbornness
• tenaciousness
• tenacity
• thoroughness
• thought
• tirelessness
• vehemence