toughness

decisiveness firmness fortitude grit perseverance persistence resolve seriousness stubbornness willpower

backbone doggedness earnestness obstinacy obstinance pluck purpose purposefulness resoluteness resolution spine volition will

decidedness iron will purposiveness will power

cowardice flexibility idleness indolence weakness

sharpness

acerbity austerity cruelty grimness hardheartedness hardness harshness rigidity rigor rigorousness sternness strictness stringency unkindness

gentility kindness mildness