be rather baffling;be all adrift [abroad];be baffled;be in a fog;without rhyme or reason;

He felt irritated and strangely fragile, as if he were recovering from a severe bout of flu.
他感到恼火和莫名其妙的虚弱,仿佛经历了一场重感冒,正在康复。
来源:《柯林斯高阶英汉双解学习词典》They can have their cases rejected, without reasons being given, by nameless officials.
他们的诉求可能会被一些不知姓名的官员们莫名其妙地驳回。
来源:《柯林斯高阶英汉双解学习词典》
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