smarten up
undumb
greenly
nerdify
cop on
fledgling
derp
act one's age
stupefying
wisen
outfake
outdumb
sheep-headed
naivety
ungrown
greenhornism
not as green as one is cabbage-looking
grow into
unfoolish
ripen
mellow out
buffoon
melt
mellow
laxen
sapient
lighten
naif
cut one's eyeteeth
dote
dephilosophize
nonstupid
unstupid
tepefy
get over oneself
deaden
stupidify
mature
weasel
naïve realist
eyewash
maddle
nonintellectual
suffer fools gladly
naivistic
sap
sapheaded
unbitch
coolen
arse
duncify
unamateurish
unperk
unreasonably
outstupid
unintellectual
soften up
rareripe
dewy-eyed
dull
infantile
indehiscent
unbefogged
pall
childish
alliteratively
resolve
tire
immaturely
jejunely
dim
gosling
intellectual
ultracrepidate
unidiotic
submoron
idiotize
cheeser
maturely
naifly
vary
baby
child
piffle
four oh four
wise
smartish
grow out of
sophisticate
unwise
drool bucket
wise off
gay-ass
tardlet
take leave of one's senses
insipient
dumbify