palatial

adjective

a palatial five-star hotel:

luxurious, deluxe, magnificent, sumptuous, splendid, grand, opulent, lavishly appointed, lavish, lush, grandiose, rich, imposing, impressive, fine, stately, regal, majestic;

fancy, upmarket, exclusive;

spacious, large-scale;

informal plush, plushy, swanky, posh, ritzy, swish;

rare palatian.

▷antonyms humble, modest.

palatial Oxford Dictionary of English