Words related to risible
"ridicule, mockery, subjection to ridicule or mockery," c. 1400, from Old French derision "derision, mockery" (13c.), from Latin derisionem (nominative derisio) "a laughing to scorn, mockery," noun of action from past-participle stem of deridere "ridicule," from de "down" (see de-) + ridere "to laugh" (see risible).
1670s, "absurd thing, object of mockery or contempt;" 1680s, "words or actions meant to invoke ridicule or excite laughter at someone's expense," from French ridicule, noun use of adjective (15c.), or from Latin ridiculum "laughing matter, a joke, a jest," noun use of neuter of ridiculus "laughable, funny, absurd," from ridere "to laugh" (see risible).
"He who brings ridicule to bear against truth, finds in his hand a blade without a hilt." [Walter Savage Landor, "Imaginary Conversations"]
1540s, ridyculouse, "worthy of ridicule or contemptuous laughter," from Latin ridiculus "laughable, funny, absurd," from ridere "to laugh" (see risible). Shakespeare and other 17c. writers sometimes spelled it rediculous.
By 18c. the sense was weakening toward "comical, amusingly absurd." The slang extension to "outrageous, scandalous" is by 1839 (see below), but its appearance in college slang late 1960s is perhaps a fresh extension. The sense of "excellent" is by 1959 in jazz slang. Related: Ridiculously; ridiculousness; ridiculosity. In the sense "concerned with jokes," Latin had ridicularius.
RIDICULOUS. This is used in a very different sense in some counties from its original meaning. Something very indecent and improper is understood by it ; as, any violent attack upon a woman's chastity is called "very ridiculous behaviour :" a very disorderly, and ill-conducted house, is also called a "ridiculous one." [Halliwell, "Dictionary of Archaic and Provincial Words," 1852]
The same use also is attested in U.S., where it was regarded as a Southern word for "outrageous" and noted as in use in 20c. in Gullah speech and among poor whites in the Ozarks.