Synonyms of authoritative in English:

authoritative


See definition of authoritative

adjective

1‘authoritative information’

SYNONYMS
reliable, dependable, trustworthy, good, sound, authentic, valid, well founded, attested, certified, verifiable
accurate, factual, from the horse's mouth
ANTONYMS

unreliable

2‘the authoritative edition’

SYNONYMS
definitive, most reliable, best, most scholarly
classic
authorized, accredited, recognized, accepted, approved, sanctioned

3‘his authoritative manner’

SYNONYMS
self-assured, assured, self-confident, confident, sure of oneself
commanding, imposing, masterful, magisterial, lordly, assertive, dogmatic, peremptory, arrogant, dominating, domineering, imperious, overbearing, bossy, authoritarian
ANTONYMS

timid, diffident