Admire vs Undefined - What's the difference?

As a verb admire

is .

lacking a definition or value.

(admir)

(obsolete) To be amazed at; to view with surprise; to marvel at.

*, II.2.4:

The poor fellow, admiring how he came there, was served in state all day long […].

* Fuller

examples rather to be admired than imitated

To regard with wonder and delight.

to look upon with an elevated feeling of pleasure, as something which calls out approbation, esteem, love or reverence;

to estimate or prize highly.

to admire''' a person of high moral worth, to '''admire a landscape

(terms derived from admire) * admirable * admirer * admiration * admirative

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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