Synonyms for Laughable:

adj.

absurd (adjective)
crazy, silly, foolish.
amusing (adjective)
comical.
farcical (adjective)
outrageous.
humorous (adjective)
risible.
laughable (adjective)
comical, farcical, eccentric, bizarre, absurd, risible, funny, comic, ridiculous, derisory, nonsensical, amusing, mirthful, preposterous, ludicrous, humorous.
ridiculous (adjective)
farcical, eccentric, curious, poppycock, absurd, grotesque, ridiculous, dubious, nonsensical, bizarre, incredible, silly, outlandish, oddball, weird, ludicrous, outrageous, preposterous, crazy, foolish, comical.

n.

insane, over-the-top, not in your right mind/not right in the head, childish, mad. laughter, zany. laughing. laughable (noun)
amusing, funny, preposterous, comic, foolish, nonsensical, humorous, derisory, comical, humourous, ridiculous, mirthful, ludicrous, risible, absurd.

Other synonyms:

insane, over-the-top, mad. laughing, zany. childish. Other relevant words:
humorous, insane, amusing, derisory, risible, over-the-top, funny, laughing, zany, mad, humourous, childish, mirthful, comic.

Usage examples for laughable

  1. The tale will be laughable – The Tragic Comedians, Complete by George Meredith Last Updated: March 7, 2009
  2. It was indeed Chiquita herself, and with her, Agostino- the ingenious rascal, whose laughable exploit with his scarecrow brigands has been already recorded- who, tired of following a profession that yielded no profits, had set out on foot for Paris- where all men of talent could find employment they said- marching by night, and lying hidden by day, like all other beasts of prey. – Captain Fracasse by Theophile Gautier
  3. It might just as well be said: " The gestures of a public speaker, no one of which is laughable by itself, excite laughter by their repetition." – Laughter: An Essay on the Meaning of the Comic by Henri Bergson