diligent
active
advertent
agog
alert
all ears
all eyes
ardent
attentive
aware
careful
concentrated
conscious
constant
continuing
devoted
dogged
earnest
elaborate
enduring
energetic
faithful
fervent
finical
finicking
finicky
hard
hardworking
heedful
immutable
inalterable
indefatigable
indomitable
industrious
insistent
intense
intent
intentive
invincible
laborious
lasting
loyal
meticulous
arduous
considerate
deferential
disinterested
oblige
observant
painstaking
punctual
sedulous
solicitous
studious
tireless
unremitting
unwearied
vigilant
zealous