Commandingly and Authoritative

adjective

• Having authority or ascendancy or influence.
  • usage: "an important official"; "the captain's authoritative manner"
  • synonyms: important
• Of recognized authority or excellence.
  • usage: "the definitive work on Greece"; "classical methods of navigation"
  • synonyms: classical, classic, definitive
• Sanctioned by established authority.
  • usage: "an authoritative communique"; "the authorized biography"
  • synonyms: authorized, authorised

• (a.) Having or proceeding from, due authority; entitled to obedience, credit or acceptance; determinate; commanding.
• (a.) Having an air of authority; positive; dictatorial; peremptory; as, an authoritative tone.