The correct spelling of the phrase "wast prudent" is actually "wasn't prudent". The reason for this is the contraction of "was not" into "wasn't", which can often be confusing to spell. The IPA phonetic transcription of "wasn't" is /ˈwɒzənt/, with the stress on the first syllable. It is important to pay attention to small details in spelling, as they can greatly influence the meaning and clarity of our written communication.