Tactile vs Undefined - What's the difference?

As adjectives the difference between tactile and undefined

is that tactile is tangible; perceptible to the sense of touch while undefined is lacking a definition or value.

(en adjective)

Tangible; perceptible to the sense of touch.

Used for feeling.

Of or relating to the sense of touch.

* H. N. Martin

The delicacy of the tactile sense varies on different parts of the skin; it is greatest on the forehead, temples and back of the forearm.

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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