Word:

Authoritative

Au`thor´i`ta`tive
a.1.Having, or proceeding from, due authority; entitled to obedience, credit, or acceptance; determinate; commanding.
The sacred functions of authoritative teaching.
- Barrow.
2.Having an air of authority; positive; dictatorial; peremptory; as, an authoritative tone.
The mock authoritative manner of the one, and the insipid mirth of the other.
- Swift.
Adj.1.authoritative - having authority or ascendancy or influence; "an important official"; "the captain's authoritative manner"
Synonyms: important
2.authoritative - of recognized authority or excellence; "the definitive work on Greece"; "classical methods of navigation"
3.authoritative - sanctioned by established authority; "an authoritative communique"; "the authorized biography"
Christian, Daedalian, absolute, absolutist, absolutistic, accepted, accurate, acquainted with, adept, adroit, approved, apt, arbitrary, aristocratic, armipotent, arrogant, artistic, ascendant, assuring, at home in, at home with, attested, authentic, authenticated, authoritarian, authorized, autocratic, binding, bossy, bravura, brilliant, canonical, cathedral, certified, charismatic, charming, circumstantiated, clean, clever, clothed with authority, cogent, competent, conclusive, confined, confirmed, consequential, considerable, consistent, controlling, conventional, conversant with, convictional, convincing, coordinated, correct, crack, crackerjack, cunning, customary, cute, daedal, decisive, deft, dependable, despotic, determinative, dexterous, dextrous, dictated, dictatorial, didactic, diplomatic, doctrinaire, documented, dogmatic, dominant, domineering, duly constituted, dynamic, effective, effectual, efficacious, eminent, empowered, enchanting, energetic, estimable, evangelical, ex cathedra, ex officio, excellent, expert, factual, faithful, familiar with, fancy, feature, featured, feudal, firm, forceful, forcible, formulary, good, goodish, governing, graceful, great, grinding, handy, hard and fast, hegemonic, hegemonistic, high-handed, high-potency, high-powered, high-pressure, high-tension, imperative, imperial, imperious, important, impressive, in force, in power, indisputable, informed in, ingenious, instructive, intimate with, irrefutable, irresistible, just, knowledgeable, lawful, leading, learned, legal, legitimate, limited, literal, logical, lordly, magisterial, magistral, magnetic, mandatory, master of, masterful, masterly, mighty, mighty in battle, momentous, monocratic, neat, no mean, of the faith, official, operative, oppressive, orthodox, orthodoxical, overbearing, overruling, peremptory, personable, persuasive, politic, potent, powerful, preceptive, preeminent, prepotent, prescribed, prescript, prescriptive, prestigious, professional, proficient, proficient in, prominent, proper, proven, puissant, quick, quite some, ranking, ready, received, regulation, reliable, repressive, reputable, resourceful, restricted, right, rubric, ruling, sanctioned, satisfactory, satisfying, scholarly, scriptural, self-consistent, senior, severe, skillful, slick, solid, some, sound, specialist, specialistic, specialized, standard, statesmanlike, statutory, strict, striking, strong, strong in, stylish, suasive, substantial, sufficient, superior, suppressive, supreme, tactful, technical, telling, textual, the compleat, the complete, totalitarian, traditional, traditionalistic, true, true-blue, trustable, trustworthy, truthful, tyrannical, tyrannous, unrefutable, up on, valid, validated, verifiable, verified, veritable, versed in, vigorous, virtuoso, vital, weighty, well-done, well-founded, well-grounded, well-read in, winning, workmanlike
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Authenticly
Authenticness
Authentics
Author
author's name
Authoress
Authorial
authoring
authoring language
authorisation
authorise
authorised
authoriser
Authorism
authoritarian
authoritarianism
-- Authoritative --
authoritatively
authorities
Authority
authority figure
Authorizable
Authorization
Authorize
Authorized
authorized shares
authorized stock
Authorized Version
Authorizer
Authorless
Authorly
Authorship
Authotype
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