WordNet sense 1 (a titled peer of the realm):

lord, nobleman

WordNet sense 2 (not reacting chemically):

unreactive

WordNet sense 3 (being of the rank of a monarch):

royal

WordNet sense 4 (having the rank of or befitting a prince):

princely

WordNet sense 5 (having the rank of or resembling or befitting a king):

kingly

WordNet sense 6 (belonging to or befitting a supreme ruler):

imperial

WordNet sense 7 (belonging to the peerage):

highborn

WordNet sense 8 (of or befitting a lord):

august, grand, lordly, August

WordNet sense 9 (belonging to or characteristic of the nobility or aristocracy):

aristocratic, gentle, patrician

WordNet sense 10 (noble and generous in spirit):

magnanimous

WordNet sense 11 (of high moral or intellectual value; elevated in nature or style):

exalted, lofty, sublime

WordNet sense 12 (impressive in appearance):

baronial, imposing, stately

WordNet sense 13 (making a strong or vivid impression):

impressive