LATIN DICTIONARYLexicon Latīnum
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“authoritative” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

authoritative
having due authority: auctoritatem, multum (plus, etc., ) auctoritatis habens (after Cic., legum verba - quo plus auctoritatis habeant, etc.): aliquid magna auctoritate affirmatum (with all the weight that character, consent, etc., can give it: both of things).
Having the air of authority: imperiosus: superbus: insolens.

Quick answer

What is the Latin word for authoritative?
The usual Latin words for “authoritative” are auctōritās, imperiōsus, superbus; also īnsolēns, multus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.