John Gill Commentary 2 Kings 10:31

"But Jehu took no heed to walk in the law of Jehovah, the God of Israel, with all his heart: he departed not from the sins of Jeroboam, wherewith he made Israel to sin." — 2 Kings 10:31 (ASV)

But Jehu took no heed to walk in the law of the Lord God of
Israel with all his heart
As to his moral conversation, he was not careful that it was according to the law of God, and what he did agreeable to it, it was not sincerely, and from the right principle:

for he departed not from the sins of Jeroboam, which made Israel to
sin ;
which he would, if he had had a cordial respect to all the commandments of the law.