The definition of ridiculous is something that clearly can't be true, and that is so silly or foolish as to be worth making fun of.
An example of ridiculous is the idea that the grass is pink and the sky is red.
Origin of ridiculousClassical Latin ridiculosus ( from ridiculum: see ridicule) or ridiculus
Deserving or inspiring ridicule; absurd, preposterous, or silly. See Synonyms at foolish.
Origin of ridiculousFrom Latin rīdiculus laughable from rīdēre to laugh
(comparative more ridiculous, superlative most ridiculous)