Jamieson, Fausset and Brown on Jeremiah 48:29

29. pride--(Is 16:6, 7). Moab was the trumpeter of his own fame. Jeremiah adds "loftiness and arrogancy" to Isaiah's picture, so that Moab had not only not been bettered by the chastisement previously endured as foretold by Isaiah, but had even become worse; so that his guilt, and therefore his sentence of punishment, are increased now. Six times Moab's pride (or the synonyms) are mentioned, to show the exceeding hatefulness of his sin.