your guess is as good as mine
I don't know any more than you do, as in As for when he'll arrive, your guess is as good as mine. [1920s]
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Is There Such A Thing As A True Synonym?Thesauruses present a catalog of synonyms from which we may pick and choose words to put into our writing, but a thesaurus used alone is a very bad thing because there is no such thing as a true synonym. Every word has its particular place in the language.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.