Defenceless
Part of speech: adjective
Definition: Without defence; undefended.
Vulnerable
Part of speech: adjective
Definition: More or most likely to be exposed to the chance of being attacked or harmed, either physically or emotionally.More likely to be exposed to Malicious programs or viruses.
Example sentence: Economic success without accountability and social inclusion is not sustainable, and new governments often must face tough choices in order to protect the poor and vulnerable.