This is the 11593rd most frequent Swedish word.
onda
Onda: evil, pain, or harm.
Here, 'ont' (related to 'onda') is used as a noun implying 'pain,' indicating physical discomfort in the back.
Jag har ont i ryggen sedan igår.
I have back pain since yesterday.
Here, 'onda' is used as an adjective meaning 'evil,' describing the witch.
Den onda häxan bodde i skogen.
The evil witch lived in the forest.
In this sentence, 'onda' is used as an adjective meaning 'bad' or 'negative,' describing the type of thoughts the subject had.