weak, tender, immature, susceptible, threatened, endangered, penetrable, compromising, assailable, unsafe, more...

resilient, impervious, protected, invulnerable, fortified

physical, social, emotional, financial, more...

guard down,   exposed, in a way,   exposed to danger,   emotionally open,   subject to abuse,   it may be beaten,   more exposed,   open to attack,   emotionally raw,   at one's mercy