It is without rhyme or reason.;for no reason at all;for nothing at all;neither rhyme nor reason;without sake ;

Folly, folly , his heart kept saying: conscious , gratuitous, suicidal folly.
他心里不住地说着: 真蠢, 真蠢,蠢得自觉自愿, 蠢得无缘无故, 蠢得自己找死!
来源:英汉文学He flew into rages over nothing, seemed unbearably raw and irritable.
他会无缘无故大发雷霆,粗暴生硬, 简直叫人受不了.
来源:词典精选例句It is a scandal that a person can be stopped for no reason by the police.
警察能无缘无故拦人,这真是令人愤慨的行径。
来源:《柯林斯高阶英汉双解学习词典》
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