blissfully

from WordNet (r) 3.0 (2006)

blissfully
    adv 1: in a blissful manner; "he was blissfully unaware of the
           danger"

from The Collaborative International Dictionary of English v.0.48

Blissful \Bliss"ful\, a.
   Full of, characterized by, or causing, joy and felicity;
   happy in the highest degree. "Blissful solitude." --Milton.
   -- {Bliss"ful*ly}, adv. -- {Bliss"ful*ness}, n.
   [1913 Webster]