The word "unsubstantialise" is not commonly used or recognized as a correct spelling in English. The correct spelling is "substantialize," which means to make something more substantial or to give it substance. The IPA phonetic transcription for "substantialize" is /səbˈstænʃ(ə)laɪz/ – the stress is on the second syllable and includes the sounds "suh-b-stan-shuh-lyze." It is important to use correct spelling when communicating in writing, to ensure clear and effective communication.