What he did was displeasing in the sight of the LORD, and he slew him also: for translation see verse 7. The Hebrew for displeasing here and “wicked” in verse 7 is the same word, simply “evil.”
Quoted with permission from Reyburn, William D. and Fry, Euan McG. A Handbook on Genesis. (UBS Helps for Translators). New York: UBS, 1997. For this and other handbooks for translators see here .