Moab hath been at ease from his youth, and he hath settled on his lees, and hath not been emptied from vessel to vessel, neither hath he gone into captivity: therefore his taste remained in him, and his scent is not changed.
Moab hath been at ease from his youth, and he hath settled on his lees - (note, Isaiah 25:6; Zephaniah 1:12). As wine left to settle on its own lees retains its flavour and strength, which it would lose by being poured from one vessel into another, so Moab, owing to its never having been dislodged from its settlements, retains its pride of strongth unimpaired.
Hath not been emptied from vessel to vessel. To make it fit for use, it used to be filtered from vessel to vessel.
His scent - retaining the image. 'The bouquet (or perfume) of the wine is not changed.'