application
assiduity
assiduousness
backbone
balls
bottom
bulldog tenacity
chutzpah
cohesiveness
concentration
constancy
courage
decisiveness
diligence
dogged perseverance
doggedness
durability
endurance
energy
engrossment
fidelity
force
fortitude
gameness
grit
guts
gutsiness
guttiness
hardiness
hardness
heart
heart of oak
heartiness
indefatigability
indomitability
industriousness
industry
infrangibility
insistence
insistency
intestinal fortitude
lastingness
leatherlikeness
loyalty
lustihood
lustiness
mettle
mettlesomeness
might
stamen
legs
adaptability
agility
alertness
bravery
creativity
elasticity
flexibility
foresight
hardihood
perseverance
prowess
resilience
resourcefulness
self-reliance
tenacity
toughness
versatility
vigor
lamina