immature
arrested
asinine
babish
babyish
backward
beardless
boyish
boylike
brattish
calflike
childlike
childly
coltish
decrepit
doddering
doddery
doited
doting
fatuous
foolish
girl-like
girlish
girllike
girly
inexperienced
infantile
infantine
juvenile
kiddish
maiden
maidenly
moronic
naive
puerile
puplike
puppyish
puppylike
retarded
senile
silly
innocent
passionate
pathetic
trivial
vulgar
manly
old
womanish
womanly