presumptuous
/pɹəˈzʌmpt͡ʃuəs/ adjective C2- Making unwarranted presumptions or assumptions, often out of arrogance or excessive self-confidence, and thus exceeding appropriate or rightful limits.
From the library
“I heard some news from Ikki (his quills make him presumptuous) of a man-thing that was entered into a wolf pack, but I did not believe.
I let myself think _once_, ‘What if I should come out first?’ quakingly, you know, for it seemed so vain and presumptuous to think I could lead the Island.
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