application
assiduity
assiduousness
balkiness
bigotry
bulldog courage
bulldog tenacity
bullheadedness
concentration
constance
constancy
demandingness
determination
diligence
dogged perseverance
doggedness
dogmatism
endurance
engrossment
exigency
fanaticism
fidelity
fixed mind
fortitude
gameness
gaminess
grittiness
hardheadedness
hardihood
hardiness
headstrongness
importunacy
importunateness
importunity
indefatigability
industriousness
industry
inflexible will
insistence
insistency
intolerance
loyalty
mettlesomeness
mulishness
nerviness
obduracy
obstinacy
obstinateness
opinionatedness
purpose
boldness
conscientiousness
directness
earnestness
foresight
impetuosity
intrepidity
lucidity
perseverance
persistence
persistency
pluck
promptitude
steadfastness
steadiness
stubbornness
thoroughness