steady persistence in a course of action, a purpose, a state, etc., esp. in spite of difficulties, obstacles, or discouragement.

Theology . continuance in a state of grace to the end, leading to eternal salvation.

noun

apathy , idleness , indolence , laziness , lethargy

noun

backbone * , constancy , continuance , cool , dedication , determination , doggedness , drive , endurance , grit * , guts * , immovability , indefatigability , moxie * , persistence , pertinacity , pluck * , prolonging , purposefulness , pursuance , resolution , sedulity , spunk , stamina , steadfastness , stick-to-itiveness , tenacity , insistency , persistency , assiduity , diligence , grit , indefatigableness , insistence , patience