nonsensical vs preposterous

nonsensical and preposterous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonsensical	No	Yes	No	No
preposterous	No	Yes	No	No

As adjectives, nonsensical and preposterous are synonyms defined as:

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

nonsensical (adjective)	preposterous (adjective)
so unreasonable as to invite derision	so unreasonable as to invite derision
having no intelligible meaning