形容词

1. 放肆的；冒昧的；自作主张的
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.

1. excessively forward

e.g. an assumptive person
on a subject like this it would be too assuming for me to decide
the duchess would not put up with presumptuous servants

Synonym: assumptiveassuming