As an adjective undefined is

lacking a definition or value.

As adjectives the difference between impure and undefined

is that impure is not pure while undefined is lacking a definition or value.

As a verb impure

is (obsolete) to defile; to pollute.

As a verb memoize

is (computing) to store (the result of a computed expression) so that it can be subsequently retrieved without repeating the computation.

As an adjective undefined is

lacking a definition or value.

As a noun dichromate

is .

As an adjective undefined is

lacking a definition or value.

As an initialism swim

is someone who isn't me; someone who isn't myself.

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between elevated and undefined

is that elevated is raised, particularly above ground level while undefined is lacking a definition or value.

As a verb elevated

is (elevate).

As adjectives the difference between lilac and undefined

is that lilac is (colour) having a pale purple colour while undefined is lacking a definition or value.

As a noun lilac

is a large shrub of the genus syringa , bearing white, pale pink or purple flowers.

As a verb alleviate

is to make less severe, as a pain or difficulty.

As an adjective undefined is

lacking a definition or value.

As a noun subclass

is (taxonomy) a rank directly below class.

As a verb subclass

is (computing) in object-oriented programming, to create a subclass of.

As an adjective undefined is

lacking a definition or value.

As an interjection toot

is honk.

As an adjective undefined is

lacking a definition or value.