Abbott-Smith Manual Greek Lexicon
φοβερός (G5398)
3 φοβερός , -ά, -όν ( φοβέω ), [in LXX chiefly for נוֺרָא , also for דְּחַל , אָיֹם ;] fearful , whether act, or pass.; act., = δεινός , causing fear, terrible (LXX) : He 10:27 , 31 12:21 Pass., = δειλός , feeling fear, timid (cl. in both senses).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain