idiotic vs ludicrous

idiotic and ludicrous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
idiotic	No	Yes	No	No
ludicrous	No	Yes	No	No

As adjectives, idiotic and ludicrous are synonyms defined as:

Other synonyms of idiotic include absurd, cockeyed, derisory, laughable, nonsensical, preposterous, ridiculous.

idiotic (adjective)	ludicrous (adjective)
so unreasonable as to invite derision	so unreasonable as to invite derision
insanely irresponsible	broadly or extravagantly humorous; resembling farce
having a mental age of three to seven years