unwary
vulnerable
arbitrary
artless
asleep
bare-handed
blind
bluff
blunt
born yesterday
broad
brusque
candid
capricious
careless
childlike
confiding
culpably negligent
defenseless
derelict
direct
downright
explicit
exposed
forthright
frank
frankhearted
free
free-speaking
free-spoken
free-tongued
genuine
goofing off
guardless
guileless
hasty
heart-to-heart
heedless
helpless
imprudent
inadvertent
inattentive
incautious
inconsiderate
indiscreet
ingenu
ingenuous
innocent
inobservant
involuntary
laissez-faire
lax
friendless
impassable
impregnable
inaudible
incoherent
powerless
unaffected
unarmed
unchanged
unconcerned
uncultivated
undamaged
undefended
unexplored
unheard
unprepared
unprotected
unsupported
valueless
bombarded
carded
discarded
disregarded
guarded
larded
regarded
retarded