Deplore vs Undefined - What's the difference?

As a verb deplore

is .

lacking a definition or value.

(deplor)

To bewail; to weep bitterly over; to feel sorrow for.

I deplore my neighbour for having lost his job.

The UNHCR deplores the recent events in Sudan.

I deplore not having listened to your advice.

To condemn; to express strong disapproval of.

I deplore how you treated him at the party.

Many people deplore the actions of a corrupt government.

(obsolete) To regard as hopeless; to give up.

(Francis Bacon)

* bewail * condemn

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(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