'Intense' in the Bible

Issachar's leaders were with Deborah, the men of Issachar supported Barak; into the valley they were sent under Barak's command. Among the clans of Reuben there was intense heart searching.

Why do you remain among the sheepfolds, listening to the shepherds playing their pipes for their flocks? As for the clans of Reuben -- there was intense searching of heart.