is similar to
with no protection or shield
"the exposed northeast frontier"; "open to the weather"; "an open wound"
is similar to
having no protecting or concealing cover
"naked to mine enemies"- Shakespeare
is similar to
(used especially of machinery) not protected by a shield
see also
lacking in security or safety
"his fortune was increasingly insecure"; "an insecure future"
see also
(often followed by `of' or `to') yielding readily to or capable of
"susceptible to colds"; "susceptible of proof"
see also
susceptible to attack
"a vulnerable bridge"