Presumptuous – Overstepping due bounds
Previous to my sumptuous (presumptuous) diet, I only ate carrots, now I overstep all boundaries and eat everything.
Examples of presumptuous in a sentence.
It was presumptuous of him to purchase the item.
The man seemed too presumptuous to be a humble leader for the nation, so he was not elected.
I don't want to sound presumptuous, but I might be the only person who can deal with the situation.