UNCONCERNEDLY
unconcernedly
(adverb) in an unconcerned manner; “war was breaking out in Europe, but she unconcernedly planned for a holiday”
Source: WordNet® 3.1
Etymology
Adverb
unconcernedly (comparative more unconcernedly, superlative most unconcernedly)
In an unconcerned manner.
Source: Wiktionary
UNCONCERNED
Un`con*cerned", a.
Definition: Not concerned; not anxious or solicitous; easy in mind;
carelessly secure; indifferent; as, to be unconcerned at what has
happened; to be unconcerned about the future.
– Un`con*cern"ed*ly, adv.
– Un`con*cern"ed*ness, n.
Happy mortals, unconcerned for more. Dryden.
Source: Webster’s Unabridged Dictionary 1913 Edition