adjective \(ˌ)im-ˈprä-bə-bəl, -ˈpräb-bəl\

: not probable : not likely to be true or to happen

Full Definition of IMPROBABLE

:  unlikely to be true or to occur; also :  unlikely but real or true
im·prob·a·bil·i·ty \-ˌprä-bə-ˈbi-lə-tē\ noun
im·prob·a·bly \-ˈprä-bə-blē, -ˈpräb-blē\ adverb

Examples of IMPROBABLE

  1. The team made an improbable comeback.
  2. <it seems improbable that the two writers never met since they traveled in the same social circles>


Middle French or Latin; Middle French, from Latin improbabilis, from in- + probabilis probable
First Known Use: 1598


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