Absurd a. : Contrary to reason or propriety; obviously and fiatly opposed to manifest truth; inconsistent with the plain dictates of common sense; logically contradictory; nonsensical; ridiculous; as, an absurd person, an absurd opinion; an absurd dream.

Absurd n. : An absurdity.

Example:
How is waiting for godot an Absurd play? (From the threater of the Absurd)?

Taxonomy
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Defination from the web:
absurd from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 1 : ridiculously unreasonable, unsound, or incongruous <an absurd argument> ...