authoritative

Adjective
  1. Having authority or ascendancy or influence (synset 301836121)
    "an important official"; "the captain's authoritative manner"
    similar to: influential - having or exercising influence or power
    same as: important
  2. Of recognized authority or excellence (synset 302302830)
    "the definitive work on Greece"
    similar to: standard - established or well-known or widely recognized as a model of authority or excellence
    same as: definitive
  3. Sanctioned by established authority (synset 301636851)
    "an authoritative communique"; "the authorized biography"
    similar to: official - having official authority or sanction
    same as: authorised, authorized

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