Difference between Ludicrous and Preposterous

LUDICROUS vs PREPOSTEROUS: ADJECTIVE

Contrary to nature, reason, or common sense; absurd. : foolish.
Completely devoid of wisdom or good sense
Having that first which ought to be last; inverted in order.
Contrary to nature or reason; not adapted to the end; utterly and glaringly foolish; unreasonably absurd; perverted.
Absurd, or contrary to common sense.
Incongruous;inviting ridicule

Serving for or exciting sport; laughable from singularity or grotesqueness; adapted to cause sportive laughter or ridicule; absurd.
Synonyms Funny, Comical, Droll, Ludicrous, Ridiculous, Laughable. Either the direct action of laughter or a corresponding sentiment is included in the signification of all these terms.
In this respect laughable is the generic word, but it is also one of the strongest. Funny is the weakest of the list, ranging from the meaning of ‘amusing’ or ‘odd’ down to its colloquial use in the sense of ‘strange.’ Comical still retains a faint suggestion of its origin in connection with the drama, being primarily used in connection with something done or seen, and hence something viewed by the mind: a comical predicament is just such as would be fit for exhibition in a comedy. Droll especially implies the odd or unfamiliar: as, a droll story, idea, fellow. Ludicrous is an advance in strength upon comical, as comical is an advance upon funny. Ridiculous is the only word in the list that throws contempt or even discredit upon the person concerned: it is allowable to tell a ludicrous story about one's friend, but not a story that makes him appear ridiculous. A thing may be ludicrous, etc., on account of its unreasonableness or violation of common sense; if it is ridiculous, it is certainly on that account. That is laughable which simply provokes a hearty laugh.
So unreasonable as to invite derision
Resembling farce

Having that last which ought to be first; reversed in order or arrangement; inverted.
Foolish; ridiculous; stupid; absurd.
Synonyms and Silly, Foolish, etc. (see absurd), monstrous, crazy, mad, wild, ludicrous. See foolish.
So unreasonable as to invite derision

Risible, Silly, Idiotic, Illogical, Outrageous, Laughable, Humorous, Humourous, Derisory, Farcical, Foolish, Nonsensical, Preposterous, Absurd, Ridiculous

Farcical, Fallacious, Silly, Idiotic, Bizarre, Risible, Illogical, Outrageous, Laughable, Derisory, Foolish, Nonsensical, Ridiculous, Absurd, Ludicrous

Risible, Silly, Idiotic, Illogical, Outrageous, Laughable, Humorous, Humourous, Derisory, Farcical, Foolish, Nonsensical, Preposterous, Absurd, Ridiculous

Farcical, Fallacious, Silly, Idiotic, Bizarre, Risible, Illogical, Outrageous, Laughable, Derisory, Foolish, Nonsensical, Ridiculous, Absurd, Ludicrous

She spoke as if his dilemma were ludicrous.
It is ludicrous to assume such a thing.
Such ludicrous supposition only re enforces my view.
New York City make laws that are ludicrous.
This is ludicrous and I want a refund.
George and it is for him as ludicrous.
Your ludicrous costume reminds me of an undertaker.
Just as ludicrous was the suggestion, from Sen.
Now, these laws, Your Honors, are ludicrous in their inception and equally ludicrous in their application.
Reiki is even more ludicrous than the already ludicrous acupuncture.

It is completely preposterous to just "start" school.
Gay is preposterous as a term describing them.
Department of English at Berkshire School is preposterous.
ED visit is preposterous and just plain wrong.
The Executive Order is preposterous in its irrationality.
Preposterous Pets: Lions, Bison and Bears, Oh My!
Wilkite movement, regarded as both preposterous and dangerous.
At one level, the sixth petition seems preposterous.
Preposterous as history, preposterous as drama, the show succeeds magnificently as bad television.
It travels through preposterous canyons on an even more preposterous trail.

What is a preposterous claim that would be a year ago?
Is Schatz buying the Missouri congressman's 'preposterous and ridiculous' revolt?