The Greek that is often translated as “evil” in English has the option of various terms in Luang with different shades of meaning.
For Acts 24:9 and Gen. 6:11, yata-hala (“bad-wrong”). “This term refers to evil behavior.”
For Acts 27:12, yota-yata (“bad-bad”). “This term refers to the evil results of behavior or to objects of poor quality. (In Acts 27:12 it refers to a bad harbor).”
For Acts 12:11 and 13:50, yatyatni (“its badness”). “This term is often used when evil comes on a person from an outside force.”
Source: Kathy Taber in Notes on Translation 1/1999, p. 9-16.