subject — that which forms a basic matter of thought, discussion, investigation, etc.: a subject of conversation.
tending — to attend by action, care, etc. (usually followed by to).
verisimilar — having the appearance of truth; likely; probable: a verisimilar tale.
vincible — capable of being conquered or overcome: vincible fears.
defenseless — If someone or something is defenseless, they are weak and unable to defend themselves properly.
defenceless — If someone or something is defenceless, they are weak and unable to defend themselves properly.
undefendable — to ward off attack from; guard against assault or injury (usually followed by from or against): The sentry defended the gate against sudden attack.