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au·thor·i·ta·tive

authoritative

 
 
pronunciation:
thor ih teI tihv
part of speech: adjective
definition 1: having or showing authority.
If you speak in an authoritative voice, people will listen.
synonyms:
masterly, powerful
similar words:
imperative, masterful
definition 2: accepted as correct and true; reliable as a source of information because said or written by an expert or authority.
The librarian gave me several authoritative books on ballet.
synonyms:
approved, reliable
antonyms:
unreliable
similar words:
authentic, official, recognized, standard
derivations: authoritatively (adv.), authoritativeness (n.)