Quick Definition
truly, really, certainly
Strong's Definition
truly
Derivation: adverb from G227 (ἀληθής);
KJV Usage: indeed, surely, of a surety, truly, of a (in) truth, verily, very
Thayer's Greek Lexicon
ἀληθῶς, adverb (from Aeschylus down), truly, of a truth, in reality; most certainly: Joh_1:47 (48); Rec.; ; Mat_14:33; Mat_26:73; (Mar_14:70); Mat_27:54; (Mar_15:39); Luk_9:27; Luk_12:44; Luk_21:3; Act_12:11; 1Th_2:13; 1Jn_2:5.
Mounce Concise Greek Dictionary
ἀληθῶς alēthōs 18x
truly, really, Mat_14:33 ; certainly, of a truth, Joh_17:8 ; Act_12:11 : truly, actually, Joh_4:18 really; surely; truly.
Abbott-Smith Greek Lexicon
ἀληθῶς ,
adv.
( < ἀληθής ).
[in LXX ( Jer_28:6 , Psa_58:1 , al. ) chiefly for H543 and cogn . forms;]
truly, surely: Mat_14:33 ; Mat_26:73 Mar_14:70 ; Mar_15:39 , Luk_9:27 ; Luk_12:44 ; Luk_21:3 , Joh_1:48 ; Joh_4:42 ; Joh_6:14 ; Joh_7:26 ; Joh_7:40 ; Joh_8:31 ; Joh_17:8 Act_12:11 , 1Th_2:13 , 1Jn_2:5 .†
STEPBible — Tyndale Abridged Greek Lexicon
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)