reason
nothing
deliberately
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without cause or reason
without reason, without cause, without any reason, for no reason, without rhyme or reason
他 无缘无故 地 消失 了。
He disappeared without cause or reason.
她 无缘无故 地 哭 了 起来。
She started crying without cause or reason.
他 的 行为 常常 无缘无故， 令人 困惑。
His actions are often without cause or reason, leaving people puzzled.