"casually" in the adverb sense
1. casually
not methodically or according to plan
"he dealt with his course work casually"
2. casually, nonchalantly
in an unconcerned manner
"glanced casually at the headlines"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License