Difference between Ludicrous and Foolish

LUDICROUS vs FOOLISH: ADJECTIVE

Devoid of good sense or judgment
Having or revealing stupidity
Capable of arousing laughter; absurd or ridiculous.
Embarrassed; abashed.
Insignificant; trivial.
Marked with, or exhibiting, folly; void of understanding; weak in intellect; without judgment or discretion; silly; unwise.
Such as a fool would do; proceeding from weakness of mind or silliness; exhibiting a want of judgment or discretion.
Absurd; ridiculous; despicable; contemptible.
Lacking good sense or judgement; unwise.
Resembling or characteristic of a fool.
Lacking or exhibiting a lack of good sense or judgment; silly.

So unreasonable as to invite derision
Resembling farce
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.
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.
Serving for or exciting sport; laughable from singularity or grotesqueness; adapted to cause sportive laughter or ridicule; absurd.

Like a fool; manifesting folly; deficient in understanding, sense, or discretion; weak in intellect or judgment; unwise.
Proceeding from or prompted by folly; exhibiting a want of discretion or discrimination; silly; vain; trifling.
Denoting or indicative of folly.
Slight; insignificant.
Synonyms Silly, Foolish (see absurd); shallow, brainless, harebrained, simple.
Ridiculous; contemptible.

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

Insane, Nonsensical, Unreasonable, Harebrained, Fatuous, Fool, Preposterous, Absurd, Asinine, Ridiculous, Misguided, Ludicrous, Silly, Stupid, Unwise

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

Insane, Nonsensical, Unreasonable, Harebrained, Fatuous, Fool, Preposterous, Absurd, Asinine, Ridiculous, Misguided, Ludicrous, Silly, Stupid, Unwise

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.

Anyone not using the AMEX deal is foolish.
MASTER: That would be very foolish of you.
Are Economic Giants Penny Wise But Pound Foolish?
Baloo knows it; I know it; the Pack know it; and even the foolish, foolish deer know.
So, the preaching of the gospel is not foolish, but the question today is: Is there such a thing as foolish preaching?
You looked foolish the last two times you said it for the previous two contracts, and you will look foolish again this time.
Of all the foolish Fears of Humankind, Fear of the Future is by far the most foolish.
There are no foolish trades, there are only foolish people.
Young and Foolish Young and foolish Why is it wrong to be Young and foolish?
That foolish idea may not be so foolish after all.