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absurd; ridiculous; silly; ludicrous; nonsensical; asinine; foolish
そんなばかばかしい話は信じられない。
I can't believe such a ridiculous story.
ばかばかしい間違いをしてしまった。
I made an absurd mistake.
この計画はばかばかしくて話にならない。
This plan is so absurd it's not worth discussing.