'Smooth' in the Bible

Does the farmer plow all day to plant seed?Does he continually dig furrows and harrow his ground [after it is prepared]?

Who say to the seers, “You must not see visions from God”;And to the prophets, “You must not prophesy to us what is right!Speak to us pleasant things and smooth words,Prophesy [deceitful] illusions [that we will enjoy].

A voice of one is calling out,“Clear the way for the Lord in the wilderness [remove the obstacles];Make straight and smooth in the desert a highway for our God.

“Among the smooth stones of the ravineIs your portion, they (the idols) are your lot;Even to them you have poured out a drink offering,You have offered a grain offering.Should I be quiet concerning these things [leaving them unpunished—bearing them with patience]?