'Smooth' in the Bible

that sends ambassadors by the sea, even in vessels of papyrus on the waters, saying, "Go, you swift messengers, to a nation tall and smooth, to a people awesome from their beginning onward, a nation that measures out and treads down, whose land the rivers divide!"

In that time, a present will be brought to Yahweh of Armies from a people tall and smooth, even from a people awesome from their beginning onward, a nation that measures out and treads down, whose land the rivers divide, to the place of the name of Yahweh of Armies, Mount Zion.

"I will go before you, and make the rough places smooth. I will break the doors of brass in pieces, and cut apart the bars of iron.

Among the smooth [stones] of the valley is your portion; they, they are your lot; you have even poured a drink offering to them. You have offered an offering. Shall I be appeased for these things?