'Vainly' in the Bible

So these nations [superficially] feared the Lord; they also served their idols, as did their children and their children’s children, just as their fathers did, so do they to this day [the date of this writing].

“How then will you vainly comfort me,For your answers remain full of falsehood?”

Do not trust in oppressionAnd do not vainly hope in robbery;If riches increase, do not set your heart upon them.