sturdiness (n.)
- body
- concreteness
- decisiveness
- density
- durability
- endurance
- energy
- firmness
- force
- fortitude
- guts
- gutsiness
- hardiness
- hardness
- heartiness
- lustiness
- mass
- materiality
- might
- mightiness
- obstinacy
- palpability
- potency
- power
- powerfulness
- robustness
- ruggedness
- solidity
- soundness
- stability
- stalwartness
- stamina
- staunchness
- steadiness
- stoutness
- strength
- substance
- substantiality
- substantialness
- tangibility
- temper
- toughness
- vigor
- vitality
