Correct spelling for the English word "wert painful" is [wˈɜːt pˈe͡ɪnfə͡l], [wˈɜːt pˈeɪnfəl], [w_ˈɜː_t p_ˈeɪ_n_f_əl] (IPA phonetic alphabet).
The term "wert painful" is not a commonly used phrase in the English language, and thus, it does not have a specific etymology. However, if you are referring to the word "wert" in isolation and its relation to the word "painful", I can provide some information.
The word "wert" is an archaic form of the verb "to be" in the second person singular past tense. It was used in Middle English and Early Modern English, particularly in the works of William Shakespeare. It is derived from Old English "wǣre" and is related to the Modern English verb "were".
On the other hand, the word "painful" has a different etymology. It comes from the Old French word "peinful" meaning "full of pain or suffering".