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Synonyms
au·thor·i·ta·tive (ə-thôŕĭ-tā́tĭv, ə-thŏŕ-, ô-thôŕ-, ô-thŏŕ-)

adjective 

  1. Having or arising from authority; official: an authoritative decree; authoritative sources.
  2. Of acknowledged accuracy or excellence; highly reliable: an authoritative account of the revolution.
  3. Wielding authority; commanding: the captain's authoritative manner.

derivatives

au·thoŕi·tátive·ly
adverb
au·thoŕi·tátive·ness
noun