resolute
abiding
arrogant
assiduous
assured
calm
cocksure
confident
constant
continuing
convinced
coolheaded
decided
determined
diligent
dogged
enduring
faithful
firm
hubristic
immutable
inalterable
indefatigable
indomitable
industrious
inexcitable
insistent
invincible
lasting
loyal
nerveless
never-failing
never-tiring
obstinate
overconfident
oversure
overweening
patient
patient as Job
permanent
perseverant
persevering
persistent
persisting
persuaded
pertinacious
plodding
plugging
poised
pompous
positive