Laughable or hilarious because of obvious absurdity or incongruity. See Synonyms at foolish.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ludicrous" in a sentence
"Saturday, Mandela and Deputy President Thabo Mbeki's offices denied what they called ludicrous allegations by Federal Alliance leader"
"More difficult to explain is the laughter excited by scenes or narrations which we call ludicrous, funny, grotesque, comic; and still more so the derisive and contemptuous laugh."
"The earliest laughter did not arise from what we call the ludicrous, but from something apparently physical -- such as touch -- though it does not follow that it would never otherwise have existed at all, for, as the mind more fully developed itself, facial expressions would flow from superior and more numerous causes."