Ridiculous or absurd; so foolish or nonsensical as to invite scorn or laughter.
そんなに高い値段を出すなんて馬鹿らしい。
It's ridiculous to pay such a high price.
あの言い訳は馬鹿らしいほど単純だ。
That excuse is laughably simple.
馬鹿らしい議論を続ける時間はないよ。
I don't have time to continue such a pointless argument.