Authoritative

[Couch Potatoe]

Having, or proceeding from, due authority; entitled
to obedience, credit, or acceptance; determinate; commanding.

[Vania]

[authority] [in action], [not to mention] actually spelled right.

[Gregory]

Able to be trusted as being accurate or true; reliable.

[Tariq Zaki]

showing that you are confident, in control, and expect to be respected and obeyed: