The definition of barbarous is something that is uncivilized or crude.(adjective)
Killing people for no reason is an example of a barbarous act.
See barbarous in Webster's New World College Dictionary
Origin: L barbarus < Gr barbaros, foreign, strange, ignorant < IE echoic base *barbar-, used for unintelligible speech of foreigners > Sans barbara-, stammering, non-Aryan
See barbarous in American Heritage Dictionary 4
Origin: From Latin barbarus
Origin: , from Greek barbaros, non-Greek, foreign; see barbarism.
Learn more about barbarous