Attent vs Undefined - What's the difference?

As adjectives the difference between attent and undefined

is that attent is (archaic) attentive, heedful; intent while undefined is lacking a definition or value.

(en adjective)

(archaic) Attentive, heedful; intent.

*1596 , (Edmund Spenser), The Faerie Queene , VI.9:

*:Whylest thus he talkt, the knight with greedy eare / Hong still upon his melting mouth attent […].

* Bible, 2 Chron. vi 40

Let thine ears be attent unto the prayer.

* 1874 , , XIV

All patiently awaited the event

Without a stir or sound, as if no less

Self-occupied, doomstricken while attent .

----

(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