ludicrous

Ludicrous is a related term of irrational.

As adjectives the difference between ludicrous and irrational

is that ludicrous is idiotic or unthinkable, often to the point of being funny while irrational is not rational; unfounded or nonsensical.

As a noun irrational is

a real number that can not be expressed as the quotient of two integers, an irrational number.

As adjectives the difference between ludicrous and witty

is that ludicrous is idiotic or unthinkable, often to the point of being funny while witty is wise, having good judgement.

As adjectives the difference between ludicrous and facetious

is that ludicrous is idiotic or unthinkable, often to the point of being funny while facetious is treating serious issues with deliberately inappropriate humour; flippant.

Amusing is a related term of ludicrous.

As adjectives the difference between amusing and ludicrous

is that amusing is entertaining while ludicrous is idiotic or unthinkable, often to the point of being funny.

As a verb amusing

is .

As adjectives the difference between stupid and ludicrous

is that stupid is lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence while ludicrous is idiotic or unthinkable, often to the point of being funny.

As an adverb stupid

is (slang|dated) extremely.

As a noun stupid

is a stupid person; a fool.

As an adjective ludicrous

is idiotic or unthinkable, often to the point of being funny.

As a noun ludicrousy is

ludicrousness.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective ludicrous is

idiotic or unthinkable, often to the point of being funny.

As adjectives the difference between ludicrous and lucrative

is that ludicrous is idiotic or unthinkable, often to the point of being funny while lucrative is producing a surplus; profitable.

As adjectives the difference between ludicrous and inane

is that ludicrous is idiotic or unthinkable, often to the point of being funny while inane is lacking sense or meaning (often to the point of boredom or annoyance).

As a noun inane is

that which is void or empty.