What does the word absurd mean

That word an adjective and it's mean is

Absurd, ridiculous, preposterous all mean inconsistent with reason or common sense. Absurd means utterly opposed to truth or reason: an absurd claim. Ridiculous implies that something is fit only to be laughed at, perhaps contemptuously: a ridiculous suggestion.

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Explanation:

It means something that is very unreasonable and illogical.

It can also mean somethings that is so ridiculous that it arouses amusement.