(prɪzʌmptʃuəs )

adjective [usually verb-link ADJECTIVE]

If you describe someone or their behaviour as presumptuous, you disapprove of them because they are doing something that they have no right or authority to do.

It would be presumptuous to judge what the outcome will be. 

Synonyms: pushy [informal], forward, bold, arrogant  More Synonyms of presumptuous

https://dictionary.cambridge.org/dictionary/english/presumptuous