grand, magnificent, imposing, stately, majestic, grandiose mean large and impressive.

grand adds to greatness of size the implications of handsomeness and dignity.

magnificent implies an impressive largeness proportionate to scale without sacrifice of dignity or good taste.

imposing implies great size and dignity but especially stresses impressiveness.

stately may suggest poised dignity, erectness of bearing, handsomeness of proportions, ceremonious deliberation of movement.

majestic combines the implications of imposing and stately and usually adds a suggestion of solemn grandeur.

grandiose implies a size or scope exceeding ordinary experience

but is most commonly applied derogatorily to inflated pretension or absurd exaggeration.