The significance of the repetition of 'absurd' in The Importance of Being Earnest is that Jack most commonly use that word to describe the things that seems weird or crazy to him.
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The play has a lot of absurd things in it that would never happen in real life. For example, Jack and Algernon eat out at expensive restaurants and then purposely leave without paying. But they are both super rich and they are well known in London so that doesn't make any sense. They can afford to pay and they could easily be tracked down.
