Extended Strong's Greek Lexicon (Abbott-Smith based)
truly
Usage: ἀληθῶς adv. (ἀληθής). [in LXX (Jer.28:6, Psa.58:1, al.) chiefly for אָמֵן and cogn. forms ;] truly, surely: Mat.14:33 26:73 Mrk.14:70 15:39, Luk.9:27 12:44 21:3, Jhn.1:48 4:42 6:14 7:26, 40 8:31 17:8 Act.12:11, 1Th.2:13, 1Jn.2:5.† (AS)