ab·surd / əbˈsərd; -ˈzərd/ • adj. (of an idea or suggestion) wildly unreasonable, illogical, or inappropriate: it would be absurd to blame contemporary Germans for Nazi crimes | [as n.] (the absurd) he had a keen eye for the absurd. ∎  (of a person or a person's behavior or actions) foolish; unreasonable. ∎  (of an object or situation) arousing amusement or derision; ridiculous.DERIVATIVES: ab·surd·ly adv.

absurd XVI. — F. absurde or L. absurdus.
So absurdity XV.