Which term best applies to the perception of a speaker as believable and reliable?

Credibility.

Credibility has two key segments: trustworthiness and expertise, which both have objective and subjective segments. trustworthiness is construct more considering subjective variables, yet can incorporate target estimations, for example, built up unwavering quality. Aptitude can be comparably subjectively seen, yet additionally incorporates generally target attributes of the source or message (e. g., qualifications, confirmation or data quality).