Helpless vs Undefined - What's the difference?

As adjectives the difference between helpless and undefined

is that helpless is unable to defend oneself or to act without help while undefined is lacking a definition or value.

(en adjective)

Unable to defend oneself or to act without help.

* 1995 , (Bryan Adams),

Then when you find yourself lyin' helpless in her arms

You know you really love a woman

Uncontrollable.

* *

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined