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Webster 1913 Edition

adv.

In a royal or kingly manner; like a king; as becomes a king.

His body shall be

royally

interred.

Dryden.

adv.

In a kingly manner; like a king; as becomes a king.

His body shall be royally interr'd.

royally ‎(comparative more royally, superlative most royally)

In a royal manner; in a manner having to do with royalty.
Unless it was decreed royally, it never got done.
(colloquial) Excessively; thoroughly.
He will be royally annoyed if you change his work.

in a royal manner

excessively, thoroughly