absurd

Etymology

First attested in 1557. From Middle French absurde, from Latin absurdus (“incongruous, dissonant, out of tune”), from ab (“away from, out”) + surdus (“silent, deaf, dull-sounding”). Compare surd.

adj

1. Contrary to reason or propriety; obviously and flatly opposed to manifest truth; inconsistent with the plain dictates of common sense; logically contradictory; nonsensical; ridiculous; silly.
   I know it sounds absurd / But please, tell me who I am 1979, “The Logical Song”, in Roger Hodgson (lyrics), Breakfast in America, performed by Supertramp
2. (obsolete) Inharmonious; dissonant.
3. Having no rational or orderly relationship to people's lives; meaningless; lacking order or value.
   Adults have condemned them to live in what must seem like an absurd universe. March 2, 1968, Joseph Featherstone, “A New Kind of Schooling”, in The New Republic
4. Dealing with absurdism.

noun

1. (obsolete) An absurdity.
2. (philosophy, often preceded by the) The opposition between the human search for meaning in life and the inability to find any; the state or condition in which man exists in an irrational universe and his life has no meaning outside of his existence.