'Treacherously' in the Bible

Didn't Zerah's son Achan act treacherously with respect to the things banned by God, and as a result God became angry at the entire community of Israel? And that man was not the only one to die because of his iniquity.'"

So Eleazar's son Phinehas the priest replied to the descendants of Reuben, the descendants of Gad, and the descendants of Manasseh, "Today we've demonstrated that the LORD is among us, because you have not acted treacherously against the LORD. Now you have delivered the Israelis from the anger of the LORD."