ridiculous (adj.) Look up ridiculous at Dictionary.com
1540s, ridyculouse, from Latin ridiculus "laughable, funny, absurd," from ridere "to laugh" (see risible). Shakespeare and other 17c. writers sometimes spelled it rediculous. Slang extensions to "outrageous" (1839); "excellent" (1959, jazz slang). Related: Ridiculously; ridiculousness. In the sense "concerned with jokes," Latin had ridicularius.