Abbott-Smith Manual Greek Lexicon
σκοτεινός (WH. -τινός) (G4652)
3 σκοτεινός (WH. -τινός) , -ή, -όν ( σκότος ), [in LXX chiefly for חֹשֶׁךְ and cogn. forms ;] dark : opp. to φωτεινός , Mt 6:23 , Lk 11:34 , 36 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain