clear
clear-eyed
clear-sighted
discriminating
perceptive
percipient
perspicacious
prescient
tactful
Argus-eyed
acute
apperceptive
appercipient
argute
astute
bright
clear-headed
cogent
deep
discreet
discriminant
discriminative
eagle-eyed
farseeing
farsighted
foreseeing
foresighted
forethoughted
forethoughtful
gnostic
incisive
insightful
judicious
keen
knowing
knowledgeable
long-sighted
longheaded
longsighted
nice
penetrating
perspicuous
piercing
provident
sagacious
sage
discern
adjourning
burning
churning
concerning
earning
learning
returning
spurning
turning
yearning
blind