Pronunciation: [ʌnhˈɜːdɒf] (IPA) 
The word "unheardof" is spelled with the prefix "un-" plus the word "heard" and the suffix "-of". The 'h' in "heard" is silent, so the spelling reflects the word's phonetic pronunciation. The IPA phonetic transcription for "unheardof" is ʌnˈhɜːd əv. This word means something that is not known or has not been experienced before. "Unheardof" is often used to describe events, ideas, or experiences that are exceptional or amazing.
The word "unheardof" originated from the combination of two words: "unheard" and "of".
The word "unheard" is derived from the Old English word "unhȳran", which means "to not hear". It is a combination of the prefix "un-" meaning "not" and "hȳran" meaning "to hear".
The word "of" in this context is a preposition indicating that something is considered or included as part of a specific category or group. It comes from the Old English word "of" which has remained relatively unchanged in meaning over time.
Therefore, combining "unheard" and "of" gives the word "unheardof", which is used to describe something that is unusual, unknown, or not previously encountered.
