An Etymological Dictionary of Astronomy and Astrophysics

Ridiculously senseless, illogical, or untrue; contrary to all reason. → reductio ad absurdum, → absurdity. See also → nonsense.

Etymology (EN): M.Fr. absurde, from L. absurdus “out of tune; foolish,” from surdus “deaf, stupid, inaudible.”

Etymology (PE): Yâvé, literally “unrelated speech,” ultimately from *ui-vaka-, from *ui- “apart, away,” → transit, + *vaka- “word, speech,” → word.