The spelling of the word "wast plausible" follows the Middle English usage of adding "-t" to the end of a verb to indicate past tense. In modern English, this would be "was plausible." The word "plausible" is pronounced /ˈplɔːzəbəl/ in IPA phonetic transcription. The first syllable is stressed, and the "a" sound is pronounced as "aw" like in the word "law." The second syllable has a schwa sound, and the final syllable is pronounced with a clear "b" sound. Together, they form a word meaning believable or credible.