The phrase "wast needful" is an archaic expression that means "was necessary." Common synonyms that can be used in place of "wast needful" include "was required," "was essential," and "was vital." Other synonyms could also include "was imperative," "was mandatory," or "was indispensable." The use of "wast needful" can make written or spoken language sound outdated and awkward, which is why it is best to use more modern, clear, and concise words to communicate effectively. By using contemporary synonyms to replace old-fashioned terms, readers and listeners can connect better with what is being conveyed, without getting distracted by obscure language.