The word "unsubstantial" in English means: Not solid or real; lacking substance., Lacking importance or weight; insignificant., Weak or flimsy; not strong or durable..
The phonetic transcription of "unsubstantial" is /ˌʌnsəbˈstænʃəl/ in British English and /ˌʌnsəbˈstænʃəl/ in American English. Click the 🔊 button to hear both pronunciations.