The spelling of the word "doeth evil" may seem a bit unusual to some, as it uses an older form of English. The sound represented by "oe" is actually pronounced like the "ee" sound in the word "bee." The "th" in "doeth" is pronounced like the "th" in "thick." When pronounced correctly, this word sounds like "duh-eth ee-vuhl." This spelling is often used in religious texts or literature from earlier periods of English history, and may not be as commonly seen in modern texts.
The phrase "doeth evil" uses an archaic form of the English verb "do". The etymology of "do" can be traced back to the Old English word "don" and the Proto-Germanic word "dōnan". Both of these words meant "to act" or "to perform". Over time, the spelling and pronunciation of "do" have evolved, but the core meaning has remained relatively unchanged.
Similarly, the word "evil" has Old English roots and can be traced to the Proto-Germanic word "ubilaz". It originally referred to something morally wrong or bad. As with "do", the spelling and pronunciation of "evil" have transformed throughout history, but its basic concept has remained consistent.
When combined, the phrase "doeth evil" signifies the act of performing or carrying out actions that are morally wrong or harmful.