Found 2 items, similar to blissfully.
English → English (WordNet)
Definition: blissfully
blissfully
adv : in a blissful manner; 
“he was blissfully unaware of the
danger”
English → English (gcide)
Definition: Blissfully
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]