kingly

adjective, king·li·er, king·li·est.

1. stately or splendid, as resembling, suggesting, or befitting a king; regal: He strode into the room with a kingly air.
2. pertaining or proper to a king: kingly power.
3. having the rank of king.
4. consisting of kings or others of royal rank: kingly personages.

adverb

5. in the manner of a king; regally.

adjective -lier or -liest

1. appropriate to a king; majestic
2. royal

adverb

3. poetic, or archaic in a manner appropriate to a king