The phrase "authoritative with" is correct and usable in written English.
It can be used when describing someone who has a commanding presence or expertise in a particular area, often in relation to their interactions with others.
Example: "The professor was authoritative with her students, ensuring they understood the material thoroughly."
Alternatives: "commanding in" or "assertive with".
Will McAvoy is handsome, forthright and authoritative, with just enough irascibility and skepticism to seem provocative.
It is brilliantly written: clear, controlled and authoritative; with confident poetical flourishes that suddenly illuminate pages of cool exposition.
Though authoritative with her young pupils and with her own children, my mother was not a confident or worldly woman.
Each figure is supposedly authoritative, with various media outlets squabbling with each other over the accuracy of each other's figures.
He smiles, his baton movements calm and authoritative, with a connoisseur's appreciation of the music, occasionally wagging his head dreamily, keeping in check his growing euphoria at the skill of their new lead trumpeter Gloria, played by Tara Fitzgerald.
Introducing the occasion, Stephen B. Cohen, who also teaches taxation at Georgetown, called Ginsburg "the greatest expert ever on the law of corporate taxation," and said that his interpretations of the tax code were "perhaps even more authoritative, with apologies to Justice Ginsburg, than the pronouncements of the United States Supreme Court".
Resources are divided into allocative and authoritative resources, with the former concerned with the material resources (or coping resources used by caregivers such as dementia care services, formal and informal caregiver support) to enable practice, and the authoritative dealing with the capability of harnessing human activities (for example, caregiver competence).
Before that, his only hint of precocity had been his authoritative war with jigsaw puzzles.
Yin Mei has a striking visual sense and an authoritative way with social and literary themes.
This was him close to his authoritative best with indications, too, that Cesc Fàbregas's radar is clicking back in.
Peter Bradshaw on Roger Ebert: stimulating, authoritative critic with formidable internet presence Russ Meyer, skin-flick auteur, dies aged 82.
