'Wholeheartedly' in the Bible

"Not one of the men who went up from Egypt, from 20 years old and above, will see the land that I promised to give to their ancestors, that is, to Abraham, Isaac, and Jacob, because none of them followed me wholeheartedly,

except Jephunneh's son Caleb, the Kenizzite, and Nun's son Joshua. They've wholeheartedly followed the LORD.'