Authoritative

He's quite authoritative.

On May 6, 2014, the Administration released the Third U.S. National Climate Assessment (NCA), the most authoritative and comprehensive source of scientific information to date about climate change impacts across all U.S. regions and on critical sectors of the economy.

Developed over four years by hundreds of the Nation’s top climate scientists and technical experts—and informed by thousands of inputs from the public and outside organizations gathered through town hall meetings, public-comment opportunities, and technical workshops across the country, the third National Climate Assessment represents the most authoritative and comprehensive knowledge base about how climate change is affecting America now, and what’s likely to come over the next century.

These days Mary is never sure to whom grammar questions should be addressed to ensure an authoritative answer.

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

Tom is quite authoritative.

Mary is outspoken and authoritative.

Only use authoritative sources.

Be wary of important-sounding information that is not coming from a clear, authoritative source, such as local government agencies and health departments, or national and international public health institutes such as the Centers for Disease Control and Prevention and the World Health Organization.

In addition to seeking authoritative sources, journalists also seek to confirm information from multiple sources.