no rhyme or reason
/ˌnəʊ ˌraɪm ɔː ˈriː.zən/idiom
no sensible explanation or logical pattern
без всякой логики, ни с того ни с сего
Русский аналог: «ни складу ни ладу»
Часто: without rhyme or reason.
“There’s no rhyme or reason to their decisions.”
“Prices change without rhyme or reason.”
“The books were arranged with no rhyme or reason.”