Synonyms:
- Spartanism,
- abstruseness,
- adamantness,
- adhesiveness,
- arduousness,
- astringency,
- austerity,
- authoritarianism,
- backbone,
- body,
- bothersomeness,
- bottom,
- bullheadedness,
- burdensomeness,
- callosity,
- callousness,
- chutzpah,
- clabbering,
- clamminess,
- clotting,
- coagulation,
- cohesiveness,
- colloidality,
- complexity,
- complication,
- concreteness,
- consistency,
- courage,
- curdling,
- decisiveness,
- demandingness,
- density,
- difficultness,
- difficulty,
- discipline,
- doughiness,
- dourness,
- durability,
- durity,
- endurance,
- energy,
- exactingness,
- firmness,
- flintiness,
- force,
- fortitude,
- gameness,
- gelatinity,
- gelatinousness,
- gluelikeness,
- gluiness,
- glutinosity,
- glutinousness,
- grimness,
- grit,
- gumlikeness,
- gumminess,
- guts,
- gutsiness,
- guttiness,
- hairiness,
- hard-bittenness,
- hard-nosedness,
- hardiness,
- hardness,
- hardness of heart,
- harshness,
- heart,
- heart of oak,
- heartiness,
- heaviness,
- immovability,
- immutability,
- impenetrability,
- implacability,
- impliability,
- incrassation,
- induration,
- inelasticity,
- inexorability,
- inflexibility,
- inspissation,
- intestinal fortitude,
- intransigeance,
- intransigence,
- intransigency,
- intransigentism,
- intricacy,
- irreconcilability,
- jellification,
- jellylikeness,
- laboriousness,
- lentor,
- lustihood,
- lustiness,
- mass,
- materiality,
- meticulousness,
- mettle,
- mettlesomeness,
- might,
- mightiness,
- moxie,
- mucilaginousness,
- nerve,
- obduracy,
- obstinacy,
- onerousness,
- oppressiveness,
- palpability,
- pastiness,
- persistence,
- persistency,
- pith,
- pluck,
- pluckiness,
- ponderability,
- potency,
- power,
- powerfulness,
- regimentation,
- relentlessness,
- resistance,
- restiveness,
- retention,
- rigid discipline,
- rigidity,
- rigor,
- rigorism,
- rigorousness,
- robustness,
- ropiness,
- ruggedness,
- severity,
- slabbiness,
- sliminess,
- snugness,
- solidity,
- soundness,
- spirit,
- spissitude,
- spunk,
- spunkiness,
- stability,
- stalwartness,
- stamina,
- staying power,
- steadiness,
- steeliness,
- sternness,
- stick-to-itiveness,
- stickiness,
- sticking power,
- stiff temper,
- stiffness,
- stodginess,
- stoniness,
- stout heart,
- stoutness,
- strength,
- strength of will,
- strenuousness,
- strictness,
- stringency,
- stringiness,
- stubbornness,
- sturdiness,
- substance,
- substantiality,
- substantialness,
- syrupiness,
- tackiness,
- tangibility,
- tenaciousness,
- tenacity,
- thickening,
- thickness,
- tightness,
- toilsomeness,
- treacliness,
- troublesomeness,
- true grit,
- unalterability,
- unbendingness,
- unchangeability,
- uncompromisingness,
- ungivingness,
- unrelentingness,
- unyieldingness,
- vigor,
- vigorousness,
- viscidity,
- viscosity,
- viscousness,
- vitality