Pronunciation: [mˈɔː pɹˈɒmɪsfə͡l] (IPA) 
The spelling "more promiseful" seems to be a variation of "more promising," but it is not a commonly accepted word. In IPA phonetic transcription, "promiseful" would be transcribed as /ˈprɒmɪsfʊl/. The addition of "more" before this would create an incorrect formation. It is important to use proper spelling and grammar to convey a clear message in written communication.
The phrase "more promiseful" is derived from the combination of the adjective "more" and the noun "promiseful". However, it is important to note that "promiseful" is not a commonly used word in contemporary English. The word "promise" is derived from the Latin word "promittere", which means "send forth, let go, promise". The suffix "-ful" is used to form adjectives that indicate being full of or characterized by the quality specified by the word stem, in this case, "promiseful" indicating being full of promises. So, "more promiseful" implies having a greater number or level of promises.
