ludicrous (adj.) Look up ludicrous at
1610s, "pertaining to play or sport" (a sense now obsolete), from Latin ludicrus "sportive" (source of Old French ludicre), from ludicrum "amusement, game, toy, source of amusement, joke," from ludere "to play," which, with Latin ludus "a game, play," which according to Watkins is perhaps is from Etruscan or perhaps is from the PIE root *leid- or *loid- "to play," perhaps (de Vaan) literally "to let go frequently" (source also of Middle Irish laidid "impels;" Greek lindesthai "to contend," lizei "plays;" Albanian lind "gives birth," lindet "is born;" Old Lithuanian ledimi "I let," Lithuanian leisti "to let," laidyti "to throw," Latvian laist "let, publish, set in motion"). Sense of "ridiculous, apt to evoke ridicule or jest" is attested from 1782. Related: Ludicrously; ludicrousness.