Extended Strong's Greek Lexicon (Abbott-Smith based)
to mourn
Usage: πενθέω, -ῶ [in LXX chiefly for אָבַל ;] to mourn (for), lament; __(a) intrans. : Mat.5:4 (5) Mat.9:15, 1Co.5:2; π. καὶ κλαίειν, Mat.16:10, Luk.6:25, Jas.4:9, Rev.18:15, 19; before ἐπί, with accusative, Rev.18:11; __(b) trans., with accusative, 2Co.12:21.† SYN.: see: θρηνέω (AS)