inhabitant of Lebanon - namely, Jerusalem, whose temple, palaces, and principal habitations were built of cedars of Lebanon.
how gracious - irony. How graciously thou wilt be treated by the Chaldees, when they come on thee suddenly, as pangs on a woman in travail (Jer 6:24)! Nay, all thy fine buildings will win no favor for thee from them. Maurer translates, “How shalt thou be to be pitied!”