fidēliter adv.with comp.
fidelis, faithfully, trustily, certainly, honestly : in amicitiā permanere, L.: vivere: sua antea fideliter acta, S.: retinent commissa (aures), H.: servit fidelius aegro, O.
fĭdēlĭter, adv., v. fidelis fin. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.