DictionaryludicrousRidiculously absurd
adjective

ludicrous

LOO-dih-krus/ˈluːdɪkrəs/

So foolish or unreasonable as to seem ridiculous.

Trying to pack a full-size sofa into a small suitcase is ludicrous.

An older woman earnestly tries to pack a full-size sofa into a small suitcase, while a nearby man cannot contain his laughter.
Etymology

The playful meaning of ludicrus survives in the earlier English sense “pertaining to play or sport.” The emphasis shifted from amusement to ridicule: something ludicrous is laughable for its foolishness or unreasonableness.

In context

CrashCourse7:56
prehistoric heritage as a scavenger has prepared you to eat anything. Anything that is food. So the idea of eating only one kind of food is just sort of inherently ludicrous.
Rethinking Civilization - Crash Course World History 201

More examples

  • They charge a ludicrous price for a tiny sandwich.
  • It's ludicrous to blame one person for everyone's mistakes.
  • His excuse sounds even more ludicrous the second time.

Forms

ludicrous · more ludicrous · most ludicrous

ludicrously adverb — In a foolish or absurd manner.

ludicrousness noun — The quality of being ridiculously unreasonable.

Similar words

ridiculous
Emphasizes deserving mockery rather than being wildly unreasonable.
absurd
Emphasizes a lack of logic or common sense.
preposterous
Suggests an idea is too unreasonable to take seriously.