John Gill Commentary 2 Kings 21:9

"But they hearkened not: and Manasseh seduced them to do that which is evil more than did the nations whom Jehovah destroyed before the children of Israel." — 2 Kings 21:9 (ASV)

But they hearkened not
To the voice of God in his law by Moses, and were not obedient to it:

and Manasseh seduced them to do more evil than did the nations whom the
Lord destroyed before the children of Israel :
he set up more idols, and drew the people into more and greater idolatries, than the old Canaanites; and these were the more aggravated by having a law given to them, and prophets sent to instruct them in it, and by the benefits and blessings bestowed upon them by the lawgiver, which laid them under greater obligations to him; see (Jeremiah 2:11Jeremiah 2:28) .