Source : Webster's Revised Unabridged Dictionary (1913)

Loyally \Loy"al*ly\, adv.
   In a loyal manner; faithfully.

Source : WordNet®

loyally
     adv : with loyalty; in a loyal manner; "government will not be
           efficient unless the people as a whole accept
           leadership loyally and enthusiastically" [ant: {disloyally}]