lofty mountains, buildings etc are very high and impressive:
He stayed at the ISH, from whose lofty heights he could see across New York.
lofty ideas, beliefs, attitudes etc show high standards or high moral qualities - use this to show approval:
lofty ideals of equality and social justice
He had set himself the lofty goal of reaching the world's top five.
seeming to think you are better than other people - used to show disapproval:
She has such a lofty manner.
—loftiness noun [uncountable]