This is the 11593rd most frequent Swedish word.
onda
Onda: evil, pain, or harm.
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.
Han hade onda tankar om sin granne.
He had bad thoughts about his neighbor.
Here, 'ont' (related to 'onda') is used as a noun implying 'pain,' indicating physical discomfort in the back.