Abbott-Smith Manual Greek Lexicon
βάρβαρος (G915)
6 βάρβαρος , -ον (prob. onomatop., descriptive of unintelligible sounds), [in LXX: Ps 113 (114):1 ( לעז ), Ez 21:31 ( 36 ) ( בּער ), II Mac 2:21 4:25 10:4 , III Mac 3:24 *;] barbarous , barbarian , strange to Greek language and culture (and also, after the Persian war, with the added sense of brutal , rude ): Ac 28:2 , 4 , Ro 1:14 , I Co 14:11 , Col 3:11 (v. Lft., in l., and Notes , 249).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain