resolute
steady
abiding
arrogant
assiduous
assured
balanced
calm
cocksure
confident
constant
continuing
convinced
cool
coolheaded
decided
determined
diligent
dogged
enduring
faithful
fast
fiducial
firm
firm as Gibraltar
fixed
hubristic
immutable
imperturbable
in equilibrium
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
disfavoring
favoring
flavoring
quavering
savoring
wavering