stamina (n.)
- application
- assiduity
- assiduousness
- backbone
- balls
- bottom
- chutzpah
- cohesiveness
- concentration
- constancy
- courage
- decisiveness
- diligence
- doggedness
- durability
- endurance
- energy
- engrossment
- fidelity
- force
- fortitude
- gameness
- grit
- guts
- gutsiness
- hardiness
- hardness
- heart
- heartiness
- indefatigability
- indomitability
- industriousness
- industry
- insistence
- insistency
- lastingness
- loyalty
- lustiness
- mettle
- mettlesomeness
- might
- mightiness
- moxie
- nerve
- obstinacy
- patience
- permanence
- perseverance
- persistence
- persistency
- pertinacity
- pith
- plodding
- pluck
- pluckiness
- potency
- power
- powerfulness
- preoccupation
- relentlessness
- resistance
- resolution
- robustness
- ropiness
- ruggedness
- sand
- sedulity
- sedulousness
- single-mindedness
- spirit
- spunk
- stability
- stalwartness
- starch
- staunchness
- steadfastness
- steadiness
- stiffness
- stoutness
- strength
- stubbornness
- sturdiness
- tenaciousness
- tenacity
- tirelessness
- toleration
- toughness
- unbreakableness
- vigor
- viscidity
- vitality
