hardiness (n.)
- assurance
- audacity
- brashness
- cohesiveness
- decisiveness
- durability
- endurance
- energy
- force
- fortitude
- gameness
- gaminess
- guts
- gutsiness
- haleness
- hardihood
- hardness
- heartiness
- lastingness
- longevity
- lustiness
- mettlesomeness
- might
- mightiness
- nerve
- obstinacy
- pertinacity
- pluckiness
- potency
- power
- powerfulness
- resistance
- resoluteness
- resolution
- robustness
- ropiness
- ruggedness
- stalwartness
- stamina
- stiffness
- stoutness
- strength
- stubbornness
- sturdiness
- tenaciousness
- tenacity
- toughness
- unbreakableness
- vigor
- viscidity
- vitality
