Princely

a. 1. Of, or relating to, a prince; regal; royal; of highest rank or authority; as, princely birth, character, fortune, and the like.

2Sense 2. Resembling or becoming a prince; grand; august; munificent; of great wealth, magnificence, or the like; as, a princely gift; princely virtues; a princely fortune; a princely entertainment.

adv. In a prince-like manner. Johnson.