improbable

 
Pronunciation: /ɪmˈprɒbəb(ə)l/

adjective

  • not likely to be true or to happen: this account of events was seen by the jury as most improbable
  • unexpected and apparently inauthentic: the characters have improbable names

Derivatives

improbably

adverb

Origin:

late 16th century: from French, or from Latin improbabilis 'hard to prove', from in- 'not' + probabilis (see probable)