Abbott-Smith Manual Greek Lexicon
βαρέως (G917)
2 βαρέως , adv. ( βαρύς ), [in LXX: β. φέρειν , Ge 31:35 ( בעיני חרה ); β. ἀκούειν , Is 6:10 ( כּבד hi.)*;] heavily , with difficulty : Mt 13:15 , Ac 28:27 (LXX).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain