there's no rhyme or reason to/for something

no rhyme or reason

No particular logic, sense, method, or meaning to a given situation, action, person, thing, group, etc. I've looked over it several times, but there's no rhyme or reason to the document we were sent this morning.

See also: no, reason, rhyme

there’s no ˌrhyme or ˈreason to/for something

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without ˌrhyme or ˈreason

no sense or logical explanation: There has been no rhyme or reason to market movements in recent weeks. ♢ Changes were being made without rhyme or reason.This phrase comes from Shakespeare’s play As You Like It: ‘But are you so much in love as your rhymes speak?’ ‘Neither rhyme nor reason can express how much’.

See also: no, reason, rhyme, something