stability, strength, constancy, firmness, resistance, stamina

establishment, solidifying, firming up; solidity, firmness, compaction, condensation

firmness, rigidity, thickness

firmness, consistence, persistence

patience, courage, emotional strength or firmness

indifference, hardness of heart, lack of concern; coolness, calmness, composure

hardness, firmness, toughness

hardness, difficulty

hardness, solidity, constancy, tenacity, endurance, restraint, endurance