'Covertly' in the Bible

Why didst thou flee away covertly, and steal away from me, and didst not tell me, that I might have conducted thee with mirth and with songs, with tambour and with harp;

and the sons of Israel do covertly things that are not right against Jehovah their God, and build for them high places in all their cities, from a tower of the watchers unto the fenced city,