stedfastly

from The Collaborative International Dictionary of English v.0.48

Sted \Sted\ (st[e^]d), n., Stedfast \Sted"fast\ (-f[.a]st), a.,
Stedfastly \Sted"fast*ly\, adv., etc.
   See {Stead}, {Steadfast}, etc.
   [1913 Webster]