cluon
know what's what
know the score
be with it
know what's going on
be on the ball
knowledgeable
abreast
sussed
clueful
gaumish
savvy
perspicacious
in the know
sagacious
sapient
informatively
well-read
up on
laanie
know-everything
know
IQ
knowledgeably
hip
nattily
bel esprit
informedly
intelligently
informativeness
informativity
good-hearted
know like the back of one's hand
sentient
au fait
sophomoric
illuminatory
shrewd
smartly
learnedly
alliteratively
brick
cognizant
gyani
insiderish
intellectual
eagle-eyed
Besserwisser
knowledgefully
quick-sighted