Adverb
in an authoritative and magisterial manner
Source: WordNetPropriety is that perfection of style which comes when a work is authoritatively constructed on approved principles. It arises from prescription, from usage, or from nature. Vitruvius
I have to admit that talking authoritatively about my students' stories can make me feel, at times, like an astronaut who has just landed on a new planet and insists on giving guided tours to its inhabitants. Etgar Keret
If women's subordination were really so 'natural,' it would not be necessary to insist so strongly upon it. It would seem that people would not have to be told authoritatively to behave 'naturally. p. 116-117. Mary Daly
she spoke authoritatively Source: Internet
Decentralized association The UUA is not a denomination in the traditional sense; the UUA is an association of congregations with no one organization able to speak authoritatively for the whole. Source: Internet
In July 1974, a study of the growth rings of one of the koi's scales reported that Hanako was 225 years old. citation The greatest authoritatively accepted age for the species is little more than 50 years. citation citation Disease Koi are very hardy. Source: Internet