The antonyms for the word "more unverifiable" include words like reliable, confirmed, certain, proven, validated, verifiable, trustworthy, and authentic. Using these words instead of "more unverifiable" will communicate a stronger, more definitive message. When describing a concept or argument, it's important to use language that reinforces the validity of your point. By using antonyms of "more unverifiable", you can add credibility to your writing and demonstrate a clear understanding of the subject matter. Additionally, it is crucial to remember that when making claims, it is necessary to back them up with sound evidence or references.