"wert quiescent" is not a word but two separate words. "Wert" is an archaic form of "were" and is pronounced as /wɜrt/ with the stress on the first syllable. "Quiescent" is pronounced as /kwiˈɛsənt/ with the stress on the second syllable. The word refers to a state of being at rest or inactive. So, "wert quiescent" would mean "were inactive." It is important to note that "wert" is rarely used in contemporary language and is only seen in old literature or traditional speech.
The phrase "wert quiescent" is not a single word but rather a combination of words in archaic English. "Wert" is the second-person singular past tense of "be" (from Old English "wǣre", meaning "was"). "Quiescent" is an adjective derived from the Latin word "quiescere", which means "to rest" or "to be at rest".
Therefore, the etymology of the phrase "wert quiescent" can be traced back to Old English and Latin.