Julius Caesar got rid of juries - how flippant is that? (6)
I believe the answer is:
casual
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for casual that I've seen before include "at ease" , "Careless; unsystematic" , "Relaxed - unintentional" , "Informal or not showing any enthusiasm" , "Informal or cursory" .)