From WordNet (r) 3.0 (2006) [wn]:
comfortably
adv 1: in mental comfort; without stress; "he works comfortably
on three continents"
2: in physical comfort; "she could have been lying comfortably
in bed getting the same relief" [ant: uncomfortably]
3: in financial comfort; "They live well"; "she has been able to
live comfortably since her husband died" [syn: well,
comfortably]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Comfortably \Com"fort*a*bly\, adv.
In a comfortable or comforting manner.
[1913 Webster]
Speak ye comfortably to Jerusalem. --Is. xl. 2.
[1913 Webster]