attentive
lawful
perceptive
Argus-eyed
active
advertent
agog
alert
all ears
all eyes
assiduous
aux aguets
awake
aware
careful
compliant
concentrated
conforming
conscientious
conscious
constant
custodial
deferential
devoted
devout
diligent
duteous
dutiful
eagle-eyed
earnest
ethical
faithful
finical
finicking
finicky
guarded
hawk-eyed
heedful
intense
intent
intentive
keen
keen-eyed
lidless
loyal
meticulous
mindful
moral
nice
niggling
anxious
candid
impartial
industrious
inquisitive
reflective
shrewd
sober
thoughtful
watchful
well-informed
fervent
servant
introspective
nonobservant
unobservant