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absurd; ridiculous; silly; ludicrous; nonsensical; asinine; foolish
そんな馬鹿馬鹿しい話は信じられない。
I cannot believe such an absurd story.
馬鹿馬鹿しいと思いながらも最後まで見てしまった。
Even though I thought it was ridiculous, I watched it to the end.
彼の言い訳は馬鹿馬鹿しくて聞いていられなかった。
His excuses are so ridiculous I cannot listen anymore.