barbarious in English dictionary barbarious Meanings and definitions of "barbarious" (dated, before 20th century, now literary) barbarous, barbaric. adjective (dated, before 20th century, now literary) barbarous, barbaric. more Grammar and declension of barbarious barbarious ( comparative more barbarious, superlative most barbarious) barbarious (comparative more barbarious, superlative most barbarious) more Sample sentences with "barbarious" Declension Stem Try again Authors