Not falsifiably, based on available facts and general knowledge.(adverb)
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Use "plausibly" in a sentence
"The moral order is what structures and orders the otherwise baffling spiritual world, and it is the genius of Charles Williams to have shown it with a certain plausibly, exploring the implications in a satisfactory way."
"John Thacker writes: rvman -- your argument, while superficially plausibly, is against completely refuted by the data."
"Now, if one adds criteria such as 'repeatably predictable observational consequences' etc one runs into a problem with regard to testing for the reality of conscious minds, since what's it's really like to be me — the totality of my qualia — plausibly is unique to me and is intrinsically not observable by anyone else."