presumptuous
Definitions
Failing to observe the limits of what is appropriate or polite; overly forward.
Assuming something to be true without sufficient evidence or justification.
Examples
It was rather presumptuous of him to assume that I would be willing to work overtime without extra pay.
She felt it was presumptuous for a stranger to offer unsolicited advice about her personal life.
It would be presumptuous to claim that we know exactly how the project will turn out before we have even begun.