Free-and-easy (6)
I believe the answer is:
casual
'free-and-easy' is the definition.
(synonyms)
This is all the clue.
(Other definitions for casual that I've seen before include "Offhand - informal" , "Cursory or nonchalant" , "Relaxed, unconcerned" , "Free-and-easy" , "Informal or cursory" .)