Thirsty vs Undefined - What's the difference?

As adjectives the difference between thirsty and undefined

is that thirsty is needing to drink while undefined is lacking a definition or value.

(er)

Needing to drink.

After all that work I am really thirsty .

Causing thirst; giving one a need to drink.

Craving something.

I am thirsty for knowledge.

After the president left office, the nation was thirsty for change.

* bloodthirsty

(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