naive
naïf
unwary
artless
befoolable
born yesterday
credulous
cullible
deceivable
deludable
dupable
easy
exploitable
fleeceable
foolable
green
hoaxable
hoodwinkable
humbugable
immature
inexperienced
ingenuous
innocent
naif
naïve
persuadable
seduceable
simple
soft
susceptible
unsophisticated
unsuspecting
unsuspicious
victimizable
wide-eyed
bumble
clueless
complacent
crass
delude
guileless
illiterate
incompetent
moronic
narrow-minded
shortsighted
touchy
trustful
uncivilized
undesigning
vulnerable
weak-minded
well-disposed
well-meaning