* Bad: This is the most general translation.
* Evil: This implies a more serious moral transgression.
* Wicked: This emphasizes a strong sense of malice.
* Harmful: This focuses on the negative consequences.
* Ugly: This can refer to something aesthetically displeasing.
* Poor: This can be used to describe something of low quality.
The best translation will depend on the specific context in which "kakos" is used.