I thought her explanation was perfectly/entirely/completely 'plausible'. [=I believed her explanation]
a 'plausible' [='possible'] conclusion
a 'plausible' excuse
(..) by sonic emission or light wave. they don't seem to ask a lot of questions. The world's most decorated experts can't crack that one. The most plausible theory is that they chose places on earth with the lowest incidence of lightning strikes. The next most plausible theory is that (..)2016 Arrival