I think the closest approximation is `` (lit. _reason is not understandable_ ).
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This is an informal expression, and depending on the context, this can be used to express your _subjective_ , personal confusion (does not make sense _to me_ ):
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... and to express that something is _objectively_ a mess:
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Indeed the first sentence can be interpreted in both ways, and people may ask back to you saying ? ?
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``, `` or something like these basically expresses the _objective_ lack of logic:
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This says the Japanese counting system is bad and illogical (to anyone).
And `` (noun) is sometimes used, focusing on subjective understanding of the speaker (It's all _Greek_ to me):
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