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like as not

Also, as like as not; as likely as not. In all probability, with an even chance, as in Like as not it'll rain by afternoon, or Likely as not the governor will run for a second term. In the first two terms, like is short for likely in the sense of “probably,” that is, “It is as likely as it is not likely.” [Late 1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for like as not

presumably, doubtless, doubtlessly, seemingly, assumably, presumptively