prompt
timely
accurate
active
alert
apt
attentive
careful
close
compliant
conforming
conscientious
conscionable
constant
correct
critical
decisive
delicate
demanding
detailed
devoted
devout
duteous
dutiful
exact
exacting
exigent
expeditious
exquisite
faithful
fastidious
fine
finical
finicking
finicky
fussy
heedful
immediate
instant
instantaneous
loyal
meticulous
mindful
minute
narrow
nice
observant
on the dot
on time
overconscientious
overscrupulous
painstaking
point
punctilious
punctuality
punctuate
punctuation
assiduous
dependable
diligent
economical
hardworking
impartial
methodical
obedient
scrupulous
sedulous
truthful
vigilant
well-informed