ludicrous

As adjectives the difference between ludicrous and insane

is that ludicrous is idiotic or unthinkable, often to the point of being funny while insane is exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted .

As adjectives the difference between ludicrous and commensurate

is that ludicrous is idiotic or unthinkable, often to the point of being funny while commensurate is of a proportionate or similar measurable standard.

As a verb commensurate is

to reduce to a common measure.

As adjectives the difference between ludicrous and undefined

is that ludicrous is idiotic or unthinkable, often to the point of being funny while undefined is lacking a definition or value.

As adjectives the difference between ludicrous and jocular

is that ludicrous is idiotic or unthinkable, often to the point of being funny while jocular is (formal) humorous]], amusing or [[joke|joking.

As adjectives the difference between crestfallen and ludicrous

is that crestfallen is sad because of a recent disappointment while ludicrous is idiotic or unthinkable, often to the point of being funny.

As adjectives the difference between ludicrous and daft

is that ludicrous is idiotic or unthinkable, often to the point of being funny while daft is insane, mad.

As adjectives the difference between ludicrous and ironic

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

Odd is a related term of ludicrous.

As an initialism odd

is oppositional defiant disorder.

As an adjective ludicrous is

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

Ludicrous is a related term of crazy.

As adjectives the difference between ludicrous and crazy

is that ludicrous is idiotic or unthinkable, often to the point of being funny while crazy is insane; lunatic; demented.

As an adverb crazy is

(slang) very, extremely.

As a noun crazy is

an insane or eccentric person; a crackpot.

Queer is a related term of ludicrous.

As adjectives the difference between queer and ludicrous

is that queer is (now|slightly|dated) weird, odd or different; whimsical while ludicrous is idiotic or unthinkable, often to the point of being funny.

As a noun queer

is (colloquial) a person who is or appears homosexual, or who has homosexual qualities.

As a verb queer

is to render an endeavor or agreement ineffective or null.

As an adverb queer

is queerly.